dispiro[2.0.2⁴.3³]nonane

2,4,5,6-四氢-1H-环丁并[f]茚

3,4,5,6-tetrahydro-1H-cyclopenta[c]thiophene 2,2-dioxide

3,4-二苯基呋咱 2-氧化物

6-methylene-3-phenyl-1,2-oxazaspiro[4.4]non-2-ene