[C:1]([N:6]1[CH2:16][CH2:15][C:9]2[N:10]=[N:11][C:12](Cl)=[CH:13][C:8]=2[CH2:7]1)(=[O:5])[CH2:2][CH2:3][CH3:4].C(O)(=O)/C=C\C(O)=O.ClC1[N:31]=[N:30]C2CCNCC=2C=1.C(Cl)(=O)CCC>C(#N)C>[C:1]([N:6]1[CH2:16][CH2:15][C:9]2[N:10]=[N:11][C:12]([NH:30][NH2:31])=[CH:13][C:8]=2[CH2:7]1)(=[O:5])[CH2:2][CH2:3][CH3:4]The 6-butyryl-3-chloro-5,6,7,8-tetrahydropyrido[4,3-c]pyridazine, required as starting material, may be produced in a manner analogous to that described in Example 8(g), from 3-chloro-5,6,7,8-tetrahydropyrido[4,3-c]pyridazine maleate and butyric acid chloride. Reaction time 27 hours. M.P. 130°-133° from acetonitrile.
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