3MB-PP1, a bulky purine analog, is a Polo-like kinase 1 ( Plk1 ) inhibitor. 3MB-PP1 blocks mitotic progression and cell division arise through target Plk1 in in cells expressing analog-sensitive Plk1 alleles. 3MB-PP1 specifically inhibits the activity of analog-sensitive Ssn3 ( Cdk8 ). 3MB-PP1 inhibits Leu93 Mutant Zipper-interacting protein kinase ( Leu93-ZIPK ; IC 50 =2 μM). 3MB-PP1 can be used for the research of hypha formation of Candida albicans and cell division.