Side chain polarity Reset Display the guanidino group as Ball & Stick. Add a distance measure (in Å units). Some facts on L-arginine. Abbreviation: Arg. One-letter code: R, as in "aRginine". Molecular mass: 174 daltons. Side chain (or R-group) features: Structural formula: Formula: -(CH2)3-NH-C-(NH2)2+; Category: polar; basic. pKa: 12.5. Return to image of Arg.
Some facts on L-arginine.