2.1.1.335 S-adenosyl-L-methionine + 4-amino-4-de(dimethylamino)anhydrotetracycline - Streptomyces rimosus S-adenosyl-L-homocysteine + 4-methylamino-4-de(dimethylamino)anhydrotetracycline - ? 438446 2.1.1.335 S-adenosyl-L-methionine + 4-methylamino-4-de(dimethylamino)anhydrotetracycline - Streptomyces rimosus S-adenosyl-L-homocysteine + anhydrotetracycline - ? 438447