19,20-dihydroervahanine a 19,20-dihydroervahanine a 19,20-dihydroervahanine a is an alkaloid, a natural product which is found in the root of the south-east asian plant tabernaemontana divaricata. it inhibits acetylcholinesterase more potently than galantamine in vitro. 19,20-dihydroervahanine a names iupac name methyl (1s,15r,17s,18s)-17-ethyl-6-octadeca-3(11),4,6,8-tetraen-12-yl]-3,13-diazapentacyclononadeca-2(10),4(9),5,7-tetraene-1-carboxylate identifiers cas number 175478-70-3 3d model (jsmol) interactive image chembl chembl2018162 pubchem cid 70687579 inchi inchi=1s/c42h52n4o4/c1-6-24-16-23-20-42(41(48)50-5)38-29(14-15-46(21-23)39(24)42)28-13-12-26(17-34(28)44-38)31-18-30-25(7-2)22-45(3)35(36(30)40(47)49-4)19-32-27-10-8-9-11-33(27)43-37(31)32/h8-13,17,23-25,30-31,35-36,39,43-44h,6-7,14-16,18-22h2,1-5h3/t23-,24-,25+,30+,31+,35-,36?,39-,42+/m0/s1key: pkhrotrjqxgciw-xivabzemsa-n smiles cc1c2c3(1n(c2)ccc4=c3nc5=c4c=cc(=c5)6c7(cn((c7c(=o)oc)cc8=c6nc9=cc=cc=c89)c)cc)c(=o)oc properties chemical formula c42h52n4o4 molar mass 676.902 g·mol−1 except where otherwise noted, data are given for materials in their standard state (at 25 °c , 100 kpa). infobox references