CC1(C)OC2C(COC(c3ccccc3)(c3ccccc3)c3ccccc3)OC(c3c[nH]c4c(N)ncnc34)C2O1
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?