The chemical IPTG has a designated molecular formula of C9H18O5S and a molecular weight of 238.298 g/mol. Synonyms may include: Isopropyl thiogalactoside, EINECS 206-703-0, Isopropyl beta-D-thiogalactopyranoside, Isopropyl beta-D-thiogalactoside, Isopropyl-beta-D-thiogalactopyranoside, Isopropyl-beta-D-thiogalactoside, Isopropy-beta-D-thiogalactopyranoside, Isopropyl beta- thiogalactoside, UNII-X73VV2246B (ChemID).