Acetic Acid → 5-{5-[[(Acetyloxy)imino](amino)methyl]-2-isobutoxy-3-pyridinyl}-2-methyl-3-propyl-2,6-dihydro-7H-pyrazolo[4,3-d]pyrimidin-7-one

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N-Hydroxy-6-isobutoxy-5-(2-methyl-7-oxo-3-propyl-6,7-dihydro-2H-pyrazolo[4,3-d]pyrimidin-5-yl)-3-pyridinecarboximidamide (Example 39) (65 mg, 0.16 mmol), N,N-dimethylaminopyridine (24 mg, 0.20 mmol), acetic acid (9.7 mg, 0.16 mmol) and 1-(3-dimethylaminopropyl)-3-ethyl-carbodiimide hydrochloride (37.5 mg, 0.20 mmol) were stirred in dioxan (2 mL) for 14 h. The solvent was removed in vacuo and the product purified by flash column chromatography (eluting with 90% dichloromethane:methanol) to give the product (58 mg) as a white solid.

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