hopantenic acid hopantenic acid hopantenic acid (homopantothenic acid), also known as n-pantoyl-gaba, is a central nervous system depressant. formulated as the calcium salt, it is used as a pharmaceutical drug in the russian federation for a variety of neurological, psychological and psychiatric conditions and sold as pantogam (russian: пантогам). hopantenic acid names preferred iupac name 4-butanoic acid identifiers cas number 18679-90-8 y17097-76-6 (calcium salt) y 3d model (jsmol) interactive image chembl chembl2110783 chemspider 26309 y kegg d08042 y pubchem cid 28281 unii h473mvb16u ylk8eoc1m6k (calcium salt) y comptox dashboard (epa) dtxsid6048331 inchi inchi=1s/c10h19no5/c1-10(2,6-12)8(15)9(16)11-5-3-4-7(13)14/h8,12,15h,3-6h2,1-2h3,(h,11,16)(h,13,14)/t8-/m0/s1 ykey: sbbdhantmhirgw-qmmmgpobsa-n y smiles cc(c)(co)(o)c(=o)ncccc(o)=o properties chemical formula c10h19no5 molar mass 233.264 g·mol−1 related compounds related alkanoic acids theaninepantothenic acid4-(γ-glutamylamino)butanoic acid related compounds panthenol except where otherwise noted, data are given for materials in their standard state (at 25 °c , 100 kpa). infobox references chemistry hopantenic acid is a homologue of pantothenic acid. while pantothenic acid is the amide of d-pantoate and β-alanine, hopantenic acid is the amide of d-pantoate and γ-aminobutyric acid (gaba). this change leads to an additional ch2 in the molecule.