urea(in) + ADP + phosphate + H(+) => urea(out) + ATP + H2O
urea(in) + adp + phosphate + h(+) => urea(out) + atp + h2o
urea(in) + ADP + phosphate + H(+) => urea(out) + ATP + H2O
urea(in) + adp + phosphate + h(+) => urea(out) + atp + h2o