Appearance White or almost white, crystalline powder. slightly soluble in water, and sparingly soluble in ethanol (96 percent). Pharmacopoeia Name Ph.Eur. 6th Edition Benzylpenicillin, Procaine BP2008 Procaine Penicillin USP31 Penicillin G Procaine Active Component Chemical Name Monohydrate of the 2-(diethylamino) ethyl 4-aminobenzoate compound with chemical name:(2S, 5R, 6R)-3.3-dimethyl-7-oxo-6-[phenylacetyl amino]-4-thia-1-azabicyclo [3.2.0] heptane-2-carboxylic acid. Structural Formula H2O