Chemical engineers work across a number of sectors, processes differ within each of these areas, but chemistry and chemical engineering roles are directly involved in the design, creation and manufacturing process of chemical products and materials. Safety of Methyl 3,6-dichloropyridazine-4-carboxylate
The present invention provides for compounds useful for treating an HIV infection, or preventing an HIV infection, or treating AIDS or ARC. The compounds of the invention are of formula I wherein A is A1, A2, A3 or A4 and R1, R2, R3, R4a, R4b, R5, R6, Ar, X1, X2, X4, X4 and X5 are as herein defined. Also disclosed in the present invention are methods of treating an HIV infection with compounds defined herein and pharmaceutical compositions containing said compounds. [image]
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Reference：
Pyridazine – Wikipedia,
Pyridazine | C4H4N2898 – PubChem