Reference of 1837-55-4, The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature.1837-55-4, Name is 3,5-Dichloropyridazine, molecular formula is C4H2Cl2N2. In a Patent，once mentioned of 1837-55-4
FACTOR IXA INHIBITORS
The present invention provides a compound of Formula (I) (structurally represented) wherein R1 is H or C1-6 alkyl, R2 is H or C1-6 alkyl or CH20H, R3 is H or C1-6 alkyl, and R4 is H or C1-6 alkyl, provided that when R1, R2, and R3 are H, R4 is C1-6 alkyl, and when R1, R2, and R4 are H, then R3 is C1-6 alkyl, and when R1, R3, and R4 are H, R2 is C1-6 alkyl or-CH20H, and when R2, R3, and R4 are H, then R1 is C 1-6 alkyl; A is 1 ) a 9-10 membered bicyclic heterocycle having 1-3 heteroatoms independently selected from N, S and 0, which 9-10 membered bicyclic heterocycle is unsubstituted or substituted with R5 and unsubstituted or substituted with R6 and unsubstituted or substituted with NH2, or 2) a 6-9 membered monocyclic or bicyclic carbocyclic ring system unsubstituted or substituted with R5, unsubstituted or substituted with R6, and unsubstituted or substituted with -CH2NH2; and B is 1) a 5- or 6-membered monocyclic heterocycle having 1 or 2 heteroatoms independently selected from N, S or 0, which is unsubstituted or substituted on a carbon or nitrogen atom with R7, unsubstituted or substituted on a carbon or nitrogen atom with R8, and unsubstituted or substituted on a carbon or nitrogen atom with R9, or 2) an 8- or 9-membered fused bicyclic heterocycle having 1, 2 or 3 nitrogen atoms which is unsubstituted or substituted on a carbon or nitrogen atom with R7, and unsubstituted or substituted on a carbon or nitrogen atom with R8; and pharmaceutical compositions comprising one or more said compounds, and methods for using said compounds for treating or preventing thromboses.
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Reference：
Pyridazine – Wikipedia,
Pyridazine | C4H4N1184 – PubChem