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Reactions carried out by PKS O-MTs. O-MTs methylate (a) the (S)-β-hydroxyl produced by an A-type KR or (b) the (R)-β-hydroxyl produced by a B-type KR, resulting in a β methoxy group. Some PKS O-MTs methylate (c) a β-keto group, resulting in an enol methylether product. O-MTs in this study are indicated below their predicted reactions.
