18455-28-2 4-27-00-09716 (Beilstein Handbook Reference) 4H-Bispyrrolo(3',2':4,5)pyrrolo(3,2-b:2',3'-i)phenoxazin-4-one, 1,2,3,3a,6b,7,8,9,9a,10,14,14a-dodecahydro-1,3a,6b,9,10,14-hexamethyl- BRN 0066784 Eserine Blue Physostigmine Blue