107812-57-7 2-Propenoic acid, 3-phenyl-, decahydro-7-hydroxy-1,1,7-trimethyl-4-methylene-1H-cycloprop(e)azulen-2-yl ester, (1aR-(1aalpha,2alpha,4aalpha,7beta,7abeta,7balpha))- Guayulin C Guayulin-C