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Huperzine B103548-82-9100 % similar Huperzine A102518-79-645 % similar (11E)-5-Amino-11-ethylidene-5,6,9,10-tetrahydro-7-methyl-5,9-methanocycloocta[b]pyridin-2(1H)-one120786-18-745 % similar