Catalyzes the transfer of a glucose moiety to the C-3 hydroxyl of mogrol to form mogroside IE (PubMed:25759326, Ref.3). Besides mogrol, UGT74AC1 also shows activity in vitro with quercetin and naringenin as substrate (PubMed:25759326). mogrol + UDP-alpha-D-glucose = H(+) + mogroside IE + UDP Mogrosides, the major active constituents of S.grosvenorii fruits, are a mixture of cucurbitane-type triterpenoid glycosides that have been proven to be powerful and zero-caloric sweeteners and can hence be used as a sucrose substitute for diabetic and obese patients. Belongs to the UDP-glycosyltransferase family.