8a-H-4,4a,7,8-tetrahydro-9-oxonaphtho[2,3-b]thiophene

4,4,7,8,8a,9-hexahydro-9-hydroxynaphtho[2,3-b]thiophene

4,9-dihydrobenzo[f][1]benzothiole

benzo[f][1]benzothiole-4,9-dione

naphtho[2,3-b]thiophen-3-ol