consistent with the solubilities , the octanol-water partition coefficients of the two 4-anilinopiperidine analogues and of meperidine were several orders of magnitude larger than those of the opioids , evidencing the fact that meperidine , fentanyl , and sufentanil are substantially more lipophilic than the opioids .
C0015846
fentanyl
C0143993
sufentanil