steviol + UDP-alpha-D-glucose => steviolmonoside + UDP + H(+)
steviol + udp-alpha-d-glucose => steviolmonoside + udp + h(+)
steviol + UDP-alpha-D-glucose => steviolmonoside + UDP + H(+)
steviol + udp-alpha-d-glucose => steviolmonoside + udp + h(+)