Synonyms: BRN 4251675;4,4a-Dihydro-5H(1)benzopyrano(4,3-c)pyridazin-3(2H)-one;4a,5-Dihydro-2H(1)benzopyrano(4,3-c)pyridazin-3(4H)-one;2H-(1)Benzopyrano(4,3-c)pyridazin-3(4H)-one, 4a,5-dihydro-;AC1MIQ1C;LS-39868;2,4,4a,5-tetrahydrochromeno[4,3-c]pyridazin-3-one;133414-47-8