10-methyl-4,5,6,9,10,11-hexahydro-3H-3,7-propanofuro[3,4-e]azecine-1,8-dione 3H-3,7-propanofuro[3,4-e]azecine-1,8-dione, 4,5,6,9,10,11-hexahydro-10-methyl-, (10R)- 6-Methyl-2-oxa-9-aza-tricyclo[7.4.3.04,13]hexadec-4(13)-ene-3,8-dione Huperzine R InChI=1/C15H21NO3/c1-10-8-12-11-4-2-6-16(14(17)9-10)7-3-5-13(11)19-15(12)18/h10,13H,2-9H2,1H3/t10-,13?/m1/s