rebaudioside D + UDP + H(+) => rebaudioside A + UDP-alpha-D-glucose
rebaudioside d + udp + h(+) => rebaudioside a + udp-alpha-d-glucose
rebaudioside D + UDP + H(+) => rebaudioside A + UDP-alpha-D-glucose
rebaudioside d + udp + h(+) => rebaudioside a + udp-alpha-d-glucose