The invention relates to phenylpropionamide compounds of Formula (I): and pharmaceutically acceptable salts, prodrugs, and solvates thereof, wherein A, B, R1, R2, R3, R4 and R5 are defined as set forth in the specification. The invention is also directed to the use of compounds of Formula (I) to treat, prevent or ameliorate a disorder responsive to the activation of opioid receptors, particularly µ-opioid receptors. Compounds of the present invention are especially useful for treating pain.
