5,8-dihydroxy-2-(3'-carbo-tert-butoxypropyl)-1,4-naphthoquinone

2-(3'-butenyl)-1,4,5,8-tetraacetoxynaphthalene

Acetic acid 4,5,8-triacetoxy-2-[4-(2-nitro-phenylselanyl)-butyl]-naphthalen-1-yl ester