KS-506a, KS-506x and KS-506g having an activity to inhibit cyclic nucleotide phosphodiesterase and KS-506m and KS-506h having an activity to inhibit histamine release are produced by culturing a microorganism belonging to the genus Mortierella.
KS-506a、KS-506x 和 KS-506g 具有抑制环核苷酸
磷酸二酯酶的活性,KS-506m 和 KS-506h 具有抑制
组胺释放的活性,它们都是通过培养属于莫蒂尔菌属的微
生物产生的。