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A third, propadienone (CH$_2$CCO), has thus far eluded observers despite the fact that it is the lowest in energy of the three. This previously noted result is in contradiction of the minimum energy principle, which posits that the abundances of isomers in interstellar environments can be predicted based on their relative stabilities - and suggests, rather, the importance of kinetic over thermodynamic effects in explaining the role of such species.\n  Here, we report results of"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1904.11396","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2019-04-25T15:01:04Z","cross_cats_sorted":["physics.chem-ph"],"title_canon_sha256":"892d99a7cf7bd4b11fc3d33962e73db4356743cf54bddf938747b15a7a6b7c00","abstract_canon_sha256":"230710185d0a1042e3f89aa3ed8e438bc671abb21f5d2dd200bccf2f564aee56"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:42:19.630628Z","signature_b64":"m6yjQ3z/FjfJnLO4XI41lXaVwnGBIUvCnpc5I1aSmQ85cb/k+5vb2FtIACoybhOhgsWssTFaoCLCa8TBYZ5XAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"2966b9b5f2b71df348509aa53d2118d837d7225d0e6a888d5f376bab39a21558","last_reissued_at":"2026-05-17T23:42:19.630073Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:42:19.630073Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"The Case of H$_2$C$_3$O Isomers, Revisited: Solving the Mystery of the Missing Propadienone","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["physics.chem-ph"],"primary_cat":"astro-ph.GA","authors_text":"Christopher N. 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This previously noted result is in contradiction of the minimum energy principle, which posits that the abundances of isomers in interstellar environments can be predicted based on their relative stabilities - and suggests, rather, the importance of kinetic over thermodynamic effects in explaining the role of such species.\n  Here, we report results of"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1904.11396","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"aliases":[{"alias_kind":"arxiv","alias_value":"1904.11396","created_at":"2026-05-17T23:42:19.630146+00:00"},{"alias_kind":"arxiv_version","alias_value":"1904.11396v1","created_at":"2026-05-17T23:42:19.630146+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1904.11396","created_at":"2026-05-17T23:42:19.630146+00:00"},{"alias_kind":"pith_short_12","alias_value":"FFTLTNPSW4O7","created_at":"2026-05-18T12:33:15.570797+00:00"},{"alias_kind":"pith_short_16","alias_value":"FFTLTNPSW4O7GSCQ","created_at":"2026-05-18T12:33:15.570797+00:00"},{"alias_kind":"pith_short_8","alias_value":"FFTLTNPS","created_at":"2026-05-18T12:33:15.570797+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/FFTLTNPSW4O7GSCQTKST2IIY3A","json":"https://pith.science/pith/FFTLTNPSW4O7GSCQTKST2IIY3A.json","graph_json":"https://pith.science/api/pith-number/FFTLTNPSW4O7GSCQTKST2IIY3A/graph.json","events_json":"https://pith.science/api/pith-number/FFTLTNPSW4O7GSCQTKST2IIY3A/events.json","paper":"https://pith.science/paper/FFTLTNPS"},"agent_actions":{"view_html":"https://pith.science/pith/FFTLTNPSW4O7GSCQTKST2IIY3A","download_json":"https://pith.science/pith/FFTLTNPSW4O7GSCQTKST2IIY3A.json","view_paper":"https://pith.science/paper/FFTLTNPS","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1904.11396&json=true","fetch_graph":"https://pith.science/api/pith-number/FFTLTNPSW4O7GSCQTKST2IIY3A/graph.json","fetch_events":"https://pith.science/api/pith-number/FFTLTNPSW4O7GSCQTKST2IIY3A/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/FFTLTNPSW4O7GSCQTKST2IIY3A/action/timestamp_anchor","attest_storage":"https://pith.science/pith/FFTLTNPSW4O7GSCQTKST2IIY3A/action/storage_attestation","attest_author":"https://pith.science/pith/FFTLTNPSW4O7GSCQTKST2IIY3A/action/author_attestation","sign_citation":"https://pith.science/pith/FFTLTNPSW4O7GSCQTKST2IIY3A/action/citation_signature","submit_replication":"https://pith.science/pith/FFTLTNPSW4O7GSCQTKST2IIY3A/action/replication_record"}},"created_at":"2026-05-17T23:42:19.630146+00:00","updated_at":"2026-05-17T23:42:19.630146+00:00"}