6NBA:
reference: S-3-Carboxypropyl-L-cysteine specifically inhibits cystathionine gamma-lyase-dependent hydrogen sulfide synthesis., Yadav PK, Vitvitsky V, Kim H, White A, Cho US, Banerjee R, J Biol Chem. 2019 Jun 3. pii: RA119.009047. doi: 10.1074/jbc.RA119.009047. PMID: 31160338

This OCA Structure page
uses Jmol, developed by the Jmol Development Team (documentation).