1(10)-Aristolen-2-one

(1aR)-1,1,7β,7aβ-Tetramethyl-1aβ,2,3,5,6,7,7a,7bβ-octahydro-1H-cyclopropa[a]naphthalene-5-one

[1aR,(+)]-1,1aβ,2,3,6,7,7a,7bβ-Octahydro-1,1,7β,7aβ-tetramethyl-5H-cyclopropa[a]naphthalen-5-one