hydroxyurea + L-ornithine => N(omega)-hydroxy-L-arginine + H2O
hydroxyurea + l-ornithine => n(omega)-hydroxy-l-arginine + h2o
hydroxyurea + L-ornithine => N(omega)-hydroxy-L-arginine + H2O
hydroxyurea + l-ornithine => n(omega)-hydroxy-l-arginine + h2o