2,2,4-三甲基-7-(2-亚甲基-1-氧代丁基)-2H-1,4-苯并恶嗪-3(4H)-酮

3,5-dimethyl-5,6-dihydrocyclopenta[f][1,3]benzoxazole-2,7-dione

2,3-dihydro-3,7-dimethyl-2,5-dioxocyclopenta(f)benzoxazol

5-(2-bromopropanoyl)-3-methyl-1,3-benzoxazol-2-one