Compounds for use in the treatment or prophylaxis of pain, including acute and chronic pain (e.g., nociceptive pain, neuropathic pain, headaches, migraine), represented by general formula I:in which: the dotted line represents a single or a double bond and R5 and R5′ are independently —H, —OH or —OR6, where R6 is a linear or branched C1-C4 alkyl X is —CH2O— Z is —CH2CH2O—, —CH(CH3)CH2O— or —CH2CH(CH3)O— m is 1 and n is an integer of 1-5. The compounds of the invention are also effective for reducing inflammation and may be used alone or in combination with other analgesics.
