Abstract: The invention provides compounds for use in the treatment of allergic diseases including juvenile asthma and eczema. The compounds can inhibit IgE mediated reaction to major environmental and occupational allergens and can also have a prophylactic effect against allergic disease by preventing allergic sensitization to environmental and occupational allergens when administered to at-risk individuals (e.g., those at genetic risk of asthma and those exposed to occupational allergens in the workplace). The compounds are also useful for inactivation or attenuation of the allergenicity of allergens in situ. The invention provides compounds and ligands per se, pharmaceutical compositions containing the compounds, processes for producing the compounds and pharmaceutical compositions, and methods for using the compounds and compositions in treatment or prophylaxis of IgE mediated allergic diseases and in inactivation or attenuation of allergens in situ.