Gabapentin,API(Active Pharmaceutical Ingredient) Gabapentin is described as 1-(aminomethyl) cyclohexaneacetic acid with a molecular formula of C9H17NO2 and a molecular weight of 171.24. CAS NO: 60142-96-3 Assay: ≥99.0%. According to USP standard. Description: Gabapentin is a white to off-white crystalline solid with a pKa1 of 3.7 and a pKa2 of 10.7. It is freely soluble in water and both basic and acidic aqueous solutions. The log of the partition coefficient (n-octanol/0.05M phosphate buffer) at pH 7.4 is ? We can offer high quality Active Pharmaceutical Ingredient with competitive price.