Chemistry is traditionally divided into organic and inorganic chemistry. HPLC of Formula: C5H5ClN2, The former is the study of compounds containing at least one carbon-hydrogen bonds.In a patent，Which mentioned a new discovery about 68206-04-2
Novelcompounds of formulae (II, III) and pharmaceutical compositions have been found to inhibit inducible NOS synthase wherein: R 4, R5, R6 and R7 are independently selected from the group consisting of hydrogen lower alkyl, and halogen; and, R8 has the structure whrein X1, X 2, X3, X4, X5, X6, R9, R13,R14 and n are as described herein.
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Reference：
Pyridazine – Wikipedia,
Pyridazine | C4H4N535 – PubChem