Arnicolide D

(3aR)-4,4a,7aα,8,9,9aα-Hexahydro-4α-(methacryloyloxy)-3β,4aβ,8α-trimethylazuleno[6,5-b]furan-2,5(3H,3aαH)-dione

2-Methylpropenoic acid [(3S)-2,3,3aα,4,4a,5,7aα,8,9,9aα-decahydro-3β,4aβ,8α-trimethyl-2,5-dioxoazuleno[6,5-b]furan-4α-yl] ester