Molecular Formula C7H15N5O4 • HCl, Purity ≥99%, Formula Weight 269.7, Synonyms: L-NG-Nitroarginine methyl ester, N(G)-Nitro-L-arginine methyl ester; A methyl ester prodrug form of the NOS inhibitor L-NNA; exhibits Ki values of 15 nM, 39 nM, and 4.4 M for nNOS (bovine), eNOS (human), and iNOS (mouse), respectively.