Patent ID: 6943259

Claim:
A compound having the structure I: where: CR 1 R 2 is selected from CHOH, C═O, CHF, CF 2 and C(CF 3 )OH; CR 6 and CR 13 are selected from CH, COH and CF; CR 7 R 8 , CR 9 R 10 and CR 11 R 12 are selected from CH 2 , CHOH, C═O, CHF and CF 2 ; and CR 3 R 4 R 5 is selected from CH 3 , CH 2 OH, C═O, COOH, CH 2 F, CHF 2 and CF 3 ; such that at least one of R 1 -R 13 includes a fluorine atom; no more than two of CR 3 R 4 R 5 , CR 6 , CR 7 R 8 , CR 9 R 10 , CR 11 R 12 , and CR 13 include a fluorine atom or an oxygen atom; and, when CR 1 R 2 is CHOH, CR 3 R 4 R 5 is not CH 2 F.