Arnicolide A

6-O-Acetyldihydrohelenalin

(3S)-4α-Acetoxy-3,3aα,4,4a,7aα,8,9,9aα-octahydro-3β,4aβ,8α-trimethylazuleno[6,5-b]furan-2,5-dione

(3S)-3,3aα,4,4a,7aα,8,9,9aα-Octahydro-4α-acetoxy-3β,4aβ,8α-trimethylazuleno[6,5-b]furan-2,5-dione

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

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