P(Oc1ccc(cc1C(C)(C)C)C(C)(C)C)(Oc2ccc(cc2C(C)(C)C)C(C)(C)C)c3ccc(cc3)c4ccc(cc4)P(Oc5ccc(cc5C(C)(C)C)C(C)(C)C)Oc6ccc(cc6C(C)(C)C)C(C)(C)C