3,6-Imino-1H-2-oxa-11c-azanaphth[1,2,3-cd]azulene-5-carboxylicacid, 2a,3,4,5,6,6a,7,11b-octahydro-11-methoxy-12-methyl-,[2aS-(2aa,3a,5a,6a,6aa,11ba)]-