This invention provides compounds of Formula I having the structure ##STR1##

wherein,

• R¹, R², R³, R⁴, R⁵, T, T¹, T², and X are as defined hereinbefore, or a pharmaceutically acceptable salt thereof, which are useful in treating or inhibiting metabolic disorders related to insulin resistance or hyperglycemia (typically associated with obesity or glucose intolerance), atherosclerosis, gastrointestinal disorders, neurogenetic inflammation, glaucoma, ocular hypertension and frequent urination; and are particularly useful in the treatment or inhibition of type II diabetes.