oxalate(in) + formate(out) => oxalate(out) + formate(in)
oxalate(in) + formate(out) => oxalate(out) + formate(in)
oxalate(in) + formate(out) => oxalate(out) + formate(in)
oxalate(in) + formate(out) => oxalate(out) + formate(in)