2,2-bis(carbamoylamino)acetate 2,2-diureidoacetate 2,2-bis(aminocarbonylamino)ethanoate CHEBI:17536 bis(carbamoylamino)acetate bis[(aminocarbonyl)amino]acetate diureidoacetate 1AL ALLANTOATE ION DIUREIDO-ACETATE ZINC00895265