5-(2-ethoxy-5-(N-acetic acid,N'-5-(2-ethoxy-5-sulfonyl)phenyl)-1-methyl-3-N-propyl-1,6-dihydro-7H-pyrazolo(4,3-d)pyrimidin-7-one-ethylenediaminesulfonylphenyl)-1-methyl-3-N-propyl-1,6-dihydro-7H-pyrazolo(4,3-d)pyrimidin-7-one
5-(2-ethoxy-5-(n-acetic acid,n'-5-(2-ethoxy-5-sulfonyl)phenyl)-1-methyl-3-n-propyl-1,6-dihydro-7h-pyrazolo(4,3-d)pyrimidin-7-one-ethylenediaminesulfonylphenyl)-1-methyl-3-n-propyl-1,6-dihydro-7h-pyrazolo(4,3-d)pyrimidin-7-one