In enzymology, a galactinol-sucrose galactosyltransferase is an enzyme that catalyzes the chemical reaction alpha-D-galactosyl--1D-myo-inositol + sucrose ⇌ {\displaystyle \rightleftharpoons } myo-inositol + raffinoseThus, the two substrates of this enzyme are alpha-D-galactosyl--1D-myo-inositol and sucrose, whereas its two products are myo-inositol and raffinose. Wikipedia