The present invention relates to a polymorphic form of (S,S)-2-N(3-O-(propan-2-ol)-1-propyl-4-hydroxybenzene)-3-phenylpropylamide or synonymously named N-[2-(4-Hydroxy-phenyl)-(2-hydroxy-propoxymethyl)-ethyl]-3-phenyl-propionamide and to the treatment or prophylaxis of pain, inflammation and/or autoimmunity and provides a method of treating or preventing pain, inflammation and/or autoimmunity as well as the use of this polymorphic form in the manufacture of medicaments for the treatment or prophylaxis of pain (preferably nociceptive or neuropathic), inflammation and/or autoimmunity in humans and/or non-human animals.