Patent ID: 7491849

Claim:
A compound of the formula where R 10 is H, R 60 is H, R 20 is ethyl, and R 70 is ethyl; each R 80 and R 90 are independently selected from H, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl, and t-butyl; R 30 , each R 40 , and R 50 are independently selected from: —CH 2 CH 2 CH 2 CH 2 — —CHOHCH 2 CH 2 CH 2 — —CH 2 CHOHCH 2 CH 2 — —CH 2 CH 2 CHOHCH 2 — —CH 2 CH 2 CH 2 CHOH— —CH 2 CH 2 CH 2 — —CHOHCH 2 CH 2 — —CH 2 CHOHCH 2 — and —CH 2 CH 2 CHOH—; and where y is an integer selected from 6, 8, 10, 11, 12, and 13; and all salts thereof.