Disclosed are novel compounds of the formula ##STR00001## Also disclosed are pharmaceutical compositions comprising the compounds of Formula I.Also disclosed are methods of treating various diseases or conditions, such as, for example, allergy, allergy-induced airway responses, and congestion (e.g., nasal congestion) using the compounds of Formula I.Also disclosed are methods of treating various diseases or conditions, such as, for example, allergy, allergy-induced airway responses, and congestion (e.g., nasal congestion) using the compounds of Formula I in combination with a H.sub.1 receptor antagonist.