O=P(O)(O)C(O)(Cn1ccnc1)P(=O)(O)O ZINC000003803652 76/64/00/372766400 XRASPMIURGNCCH-UHFFFAOYSA-N -4 272.09 CA -1.115 3 Anodyne high CAAAHL O=P([O-])([O-])C(O)(Cn1ccnc1)P(=O)([O-])[O-] fda