7-isopropylidene-1,4-dimethyl-2,3,4,5,6,8-hexahydro-1H-azulene

1,4-dimethyl-7-propan-2-ylidene-2,3,4,5,6,8-hexahydro-1H-azulene

1,4-Dimethyl-7-(1-methylethylidene)-1,2,3,4,5,6,7,8-octahydroazulene

1,2,3,4,5,6,7,8-Octahydro-1,4-dimethyl-7-(1-methylethylidene)-azulene