syn-propenethial is undetected in TMC-1 (N < 1.5e10 cm^-2) because gas-phase formation yields ~95% anti and tunneling isomerizes the rest on ~10^3 yr timescales.
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Laboratory spectroscopy, theoretical characterization, and astronomical search for syn-propenethial (CH2CHCHS)
syn-propenethial is undetected in TMC-1 (N < 1.5e10 cm^-2) because gas-phase formation yields ~95% anti and tunneling isomerizes the rest on ~10^3 yr timescales.