O=C(OC1Cc2c(O)cc(O)cc2OC1c1cc(O)c(=O)c2c(O)c(O)cc(C3Oc4cc(O)cc(O)c4CC3OC(=O)c3cc(O)c(O)c(O)c3)c2c1)c1cc(O)c(O)c(O)c1
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?