dropping my item from a entity from another mod

my mcreator item should drop out of an entity from another mod. In my case, I am making an addon for scape and run: parasites on 1.12.2, and assimilated enderman should drop the corrupted ender pearl I have already created. I only found a block with the check: "is current entity is (sub)type of (entity)". I made a simple and working with vanilla mobs procedure, with a check for a template vanilla entity and an item dropout. I unlocked the code and tried to change the vanilla entity to the assimilated enderman class, but it didn't work. I'm bad at modding, but I think this information can help: entity id: srparasites:sim_enderman; entity class: EntityInfEnderman.