[1] Univ Tennessee, Ctr Hlth Sci, Dept Pharmaceut Sci, Memphis, TN 38163 USA
[2] Univ Hawaii, Ctr Canc, Honolulu, HI 96813 USA
[3] Univ Hawaii, Ctr Canc, Nat Prod Program, Honolulu, HI 96813 USA
[4] Univ Hawaii, Ctr Canc, Expt Therapeut Program, Honolulu, HI 96813 USA