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HS-79 is an enantiomer of Fasnall, which is a selective fatty acid synthase (FASN) inhibitor. HS-79 is able to inhibit the incorporation of tritiated acetate into lipids with an IC50 of 1.57 μM.

ChEBI: (R)-Fasnall is an N-(1-benzylpyrrolidin-3-yl)-5,6-dimethylthieno[2,3-d]pyrimidin-4-amine in which the chiral centre has R configuration. Both enantiomers act as fatty acid synthase inhibitors, although the (S)-enantiomer was found to be more than 4 times as active as the (R)-enantiomer. It has a role as a fatty acid synthesis inhibitor and an EC 2.3.1.85 (fatty acid synthase) inhibitor. It is an enantiomer of a (S)-Fasnall.

[1] Alwarawrah Y, et al. Fasnall, a Selective FASN Inhibitor, Shows Potent Anti-tumor Activity in the MMTV-Neu Model of HER2(+) Breast Cancer. Cell Chem Biol. 2016 Jun 23;23(6):678-88. DOI:10.1016/j.chembiol.2016.04.011