a (2R)-2-methylacyl-CoA => a (2S)-2-methylacyl-CoA
a (2r)-2-methylacyl-coa => a (2s)-2-methylacyl-coa
a (2R)-2-methylacyl-CoA => a (2S)-2-methylacyl-CoA
a (2r)-2-methylacyl-coa => a (2s)-2-methylacyl-coa