L-Homocysteine
L-2-Amino-4-mercaptobutiric acid

C4H9NO2S

This molecule contains the follow organic groups: amino, carboxilic acid and sulphidryl.

Catabolism of methionine, threonine, isoleucine and valine (3D)
Catabolism of threonine, tryptophan, glycine, alanine, cysteine and serine (3D)
Synthesis of aspartate, methionine, lysine and threonine (3D)
Synthesis of serine, glycine and cysteine (3D)
Sulfur metabolism (Kyoto University)