Involved in the production of the bitter neohesperidosides in citrus. Shows a strict specificity for UDP-rhamnose as donor. flavanone 7-O-beta-D-glucoside + UDP-beta-L-rhamnose = flavanone 7-O-[alpha-L-rhamnosyl-(1->2)-beta-D-glucoside] + H(+) + UDP Monomer. Expressed in young fruits and leaves. Inhibited by 10 uM UDP. Belongs to the UDP-glycosyltransferase family.