6,9-Dimethyl-7-nitro-3-phenylsulfanyl-2,3-dihydro-benzo[de]chromene-3-carbonitrile

3,6,9-trimethylnaphtho<1,8-bc>pyran

7-nitro-3,6,9-trimethyl-2,3-dihydronaphtho<1,8-bc>pyran-3-ol

6,9-dimethyl-3-(4-methylpent-3-enyl)-7-nitro-2,3-dihydronaphtho<1,8-bc>pyran-3-ol