22,23-Dihydro-5-O-demethylavermectin A1a 22,23-Dihydroavermectin B(1)a 22,23-Dihydroavermectin B1a 71827-03-7 Avermectin A1a, 22,23-dihydro-5-O-demethyl- Avermectin A1a, 5-O-demethyl-22,23-dihydro- BRN 4643153 Dihydroavermectin B1a EINECS 276-046-2