offer an anti allergic drug useful in the treatment of those allergic diseases in which ige is involved as experiments 4 and 5 show the compound of the present invention also have the ability to inhibit the production of igm and igg and therefore its utility will be expanded to the treatment of allergic diseases caused by type ii or iii hypersensitive reaction such as serum sickness and hemolytic diseases of new born due to rh incompatibility the following experiments are provided by way of further illustrations of the activities of the compound of the present invention inhibition of con a induced reaction of t lymphocyte blastogenesis by spergualin trihydrochloride spleen cells from balb c mice were distritubed among wells in a microplate so that each well contained 2 u00d7 10 5 cells 0 2 ml the compound was added to all wells but one the latter being used as a control con a 5 u03bcg ml was added to all the wells and the so prepared cell suspensions were cultivated in a 5 co 2 incubator for 72 hours at 37 u00b0 c eight hours before the completion of the incubation 1 u03bcci of 3 h thymidine was added to each well and the uptake of the thymidine by the cultured cells was measured with a liquid scintillation counter to estimate the progress of the reaction of t lymphocyte blastogenesis the percentage inhibition of the blastogenesis by the test compound was calculated by 1.