Wikipedia:  

HEPES

N-2-Hydroxyethylpiperazine-N'-ethanesulfonic acid; 4-(2-Hydroxyethyl)-1-piperazineethanesulfonic acid; N-2-Hydroxyethylpiperazine N',2'-ethanesulfonic acid; N-2-Hydroxyethylpiperazine-N'-ethanesulfonate; 4-(2-Hydroxyethyl)-1-piperazineethane sulfonic acid; HEPES; 1-Piperazineethanesulfonic acid, 4-(2-hydroxyethyl)-; N-2-Hydroxyethylpiperazine-N-ethane sulfonic acid; 4-(2-Hydroxyethyl)piperazin-1-ylethanesulphonic acid
Molecular Formula
C8 H18 N2 O4 S
Natural Isotopic Abundance Mass
238.3045200000
Mono-Isotopic Molecular Masses
C12N14:   238.098727767
C13N14:   246.125566469
C12N15:   240.092797553
C13N15:   248.1196362554
HEPES image
HEPES
InCHi String:
InChI=1S/C8H18N2O4S/c11-7-5-9-1-3-10(4-2-9)6-8-15(12,13)14/h11H,1-8H2,(H,12,13,14)

isomeric and canonical SMILES:
C1CN(CC[NH+]1CCO)CCS(=O)(=O)[O-]


IUPAC: IUPAC traditional: IUPAC cas: IUPAC openeye: IUPAC systematic
2-[4-(2-hydroxyethyl)-2,3,5,6-tetrahydropyrazin-1-yl]ethanesulfonate



PubChem Substance (SID):   85165019   166367
PubChem Compound (CID):   23830
KEGG: Compound ID   n/a
CAS Registry IDs:   7365-45-9   75277-39-3
PDB Chemical Component   EPE
Miscellaneous Databases and IDs:   EINECS 230-907-9   Beilstein Handbook Reference 5-23-02-00379   NSC 166663

Reference data were obtained primarily from the PubChem database.

Three dimensional molecular rendering uses Jmol.