3,3,6,6-tetramethyl-2,4,5,7-tetrahydroacridine-1,8-dione

2-chloro-3-hydroxy-5,5-dimethylcyclohex-2-en-1-one

5',5',6,6-tetramethylspiro[5,7-dihydro-1,3-benzoxaselenole-2,2'-cyclohexane]-1',3',4-trione

6,6-二甲基-6,7-二氢-1-苯并呋喃-4(5H)-酮

2,6-dihydroxy-4,4-dimethylcyclohexa-2,5-dien-1-one