Isopropyl beta-D-thiogalactopyranoside异丙基-β-D-硫代半乳糖苷 Isopropyl-Beta-d-ThiogalactopyranosideIsopropyl-Beta-d-Thiogalactopyranoside IsoPropyl b-D-ThioGalactoside异丙b-D-ThioGalactoside isopropy-β-D-thiogalactoside