isoxazolin-5-one + O-acetyl-L-serine <=> 3-(5-oxoisoxazolin-2-yl)-L-alanine + acetate + H(+)
isoxazolin-5-one + o-acetyl-l-serine <=> 3-(5-oxoisoxazolin-2-yl)-l-alanine + acetate + h(+)
isoxazolin-5-one + O-acetyl-L-serine <=> 3-(5-oxoisoxazolin-2-yl)-L-alanine + acetate + H(+)
isoxazolin-5-one + o-acetyl-l-serine <=> 3-(5-oxoisoxazolin-2-yl)-l-alanine + acetate + h(+)