英文别名Avermectin A1a, 5-O-demethyl-3,4,22,23-tetrahydro; Ivermectin Impurity 11(Ivermectin EP Impurity K); Ivermectin Impurity K; (4R) and (4S)-5-O-Demethyl-3,4,22,23-tetrahydroavermectin A1a; Ivermectin imp K; H4B1a isomers; Ivermectin impurity 12; Ivermectin impurity 
