January Hydrogen chloride cation
HCl+
February Magnesium monocyanoacetylide
MgC3N
March Magnesium monobutadiynide
MgC4H
April Benzyne
C6H4
May Benzonitrile
C6H5CN
June Thioforymyl radical
HSC
July Thioketene
H2CCS
August Vinyl mercaptan
*C2H3SH
*
September Isocyanogen
CNCN
October Isopropyl cyanide
i-C3H7CN
November Z-Cyanomethanimine
HNCHCN
December Z-Propargylimine
HNCHCCH
red stars * indicate a non-detection
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