D-ornithine + citrate + ATP = N(5)-[(S)-citryl]-D-ornithine + AMP + diphosphate + H(+)
d-ornithine + citrate + atp = n(5)-[(s)-citryl]-d-ornithine + amp + diphosphate + h(+)
"D-ornithine--citrate ligase"
"d-ornithine--citrate ligase"