(5E,9E,13E,17E)-5,9,14,18,22-pentamethyltricosa-1,5,9,13,17,21-hexaene

(5E,9E,13E,17E)-5,9,14,18-tetramethyldocosa-1,5,9,13,17,21-hexaene

2,6-二甲基庚-1,5-二烯

乙醛