N-[2-[3,4-(methylenedioxy)phenyl]ethyl]-2,6-dioxo-1-azaspiro[4.4]non-7-ene

1-(2-(benzo[d][1,3]dioxol-5-yl)ethyl)-7-(phenylselanyl)-1-azaspiro[4.4]nonane-2,6-dione

N-[2-[3,4-(methylenedioxy)phenyl]ethyl]-1-azaspiro[4.4]nona-6,8-diene

2,3-dehydrocephalotaxan-8-one

2,3,8-trioxocephalotaxane