(3R)-6β-Ethoxy-1,2,3,4,5,6,8,8aβ-octahydro-3β,6α,8,8-tetramethyl-7H-3aα,7α-methanoazulene

[3R-(3alpha,3abeta,6alpha,7beta,8aalpha)]-6-ethoxyoctahydro-3,6,8,8-tetramethyl-1H-3a,7-methanoazulene