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xanthosine 5'-phosphate biosynthesis
EC 126.96.36.199 7-methylxanthosine synthase
EC 188.8.131.52 theobromine synthase
EC 184.108.40.206 caffeine synthase
EC 220.127.116.11 5'-nucleotidase
EC 18.104.22.168 N-methyl nucleosidase