Propionic acid [(3R,8aβ)-octahydro-3β,6,8,8-tetramethyl-1H-3aα,7α-methanoazulen]-6β-yl ester

[3R-(3alpha,3abeta,6alpha,7beta,8aalpha)]-octahydro-3,6,8,8-tetramethyl-1H-3a,7-methanoazulen-5-yl propionate