hydroxyurea + O-acetyl-L-serine <=> O-ureido-L-serine + acetate + H(+)
hydroxyurea + o-acetyl-l-serine <=> o-ureido-l-serine + acetate + h(+)
hydroxyurea + O-acetyl-L-serine <=> O-ureido-L-serine + acetate + H(+)
hydroxyurea + o-acetyl-l-serine <=> o-ureido-l-serine + acetate + h(+)