O=C(O[C@H](/C=C/c1ccccc1)P1(=O)N(Cc2ccccc2)[C@@H]2CCCC[C@H]2N1Cc1ccccc1)c1ccccc1
The donor in a hydrogen bond is usually a strongly electronegative atom such as N, O, or F that is covalently bonded to a hydrogen bond. How many hydrogen bond donors does the molecule have?