2,3-diamino-5,6,7,8-tetrahydro-1H-pyrazolo[1,2-a]pyridazin-1-one methanesulfonate

3-amino-2-[(2-amino-3-chloro-5-methyl-4-oxocyclohexa-2,5-dien-1-ylidene)amino]-5,6,7,8-tetra-hydro-1H-pyrazolo[1,2-a]pyridazin-1-one