英文别名Palbociclib impurity 1; Parecoxib Impurity 25; 4-(5-Methyl-3-phenyl-4-isoxazolyl)-ethyl Ester Benzenesulfonic Acid; ethyl 4-(5-methyl-3-phenyl-isoxazol-4-yl)benzenesulfonate; ethyl 4-(5-methyl-3-phenyl-1,2-oxazol-4-yl)benzenesulfonate; Benzenesulfonic acid, 4-(5-methyl-3-phenyl-4-isoxazolyl)-, ethyl ester 
