5 3 pentenyl 1 3 6 8 decatetraene July 8, 2019 16 32 64 128 5 7 12 14-pentacenetetrone 5 9 13-pentadecatrien-2-one 6 10 14-trimethyl- (e e)- 3 3-diethylpent-1 5-diyn
