L-arginine (R)

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Display the guanidino group as Ball & Stick.
Add a distance measure (in Å units).

Some facts on L-arginine.

1. Abbreviation: Arg.
2. One-letter code: R, as in "aRginine".
3. Molecular mass: 174 daltons.
4. Side chain (or R-group) features:
   • Structural formula:
     
   • Formula: -(CH₂)₃-NH-C-(NH₂)₂⁺;
   • Category: polar; basic.
   • pK_a: 12.5.