7-methyl[1]benzopyrano[4,3-d][1]benzoxacino[4,3-b]pyridine-6,16-dione

(2-溴苯甲酰)乙酸乙酯

4,6-胆固醇二烯-3-酮

3'-carbethoxy-2'-methyl-3-oxocholestan-<7ξ,5ξ-de>-6,7-dihydropyran

3-甲基-5-乙基-2-环戊烯-1-酮