Oc1c(Cl)cc2cc1-c1cc(cc(Cl)c1O)CCc1c(cc(Cl)c(O)c1Cl)-c1cc(Cl)c(c(Cl)c1O)/C=C\2
In analogy to the rule of five, it has been proposed that ideal fragments should follow the rule of three, in which the molecular weight of a fragment is <300, the c LogP is ≤3, the number of hydrogen bond donors is ≤3 and the number of hydrogen bond acceptors is ≤3. The molecule meets rule of three or not?