5a,6,7,8,9,10,11,11a-octahydro-1H-naphtho[2,3-g]quinoline-2,5,12-trione

7,8,9,10-tetrahydro-1H-naphtho[2,3-g]quinoline-2,5,12-trione

1,3,4,5,6,7-hexahydro-2-benzothiophene 2,2-dioxide

1,4,5,6,7,8-hexahydro-benzo[d][1,2]oxathiin 3-oxide

1,4,5,6,7,8-hexahydroisochromen-3-one