can I have a block of xilinx blocksets in simulink which would be able to calculate complex conjugate?

Hi every body. I am working on a project with Xilinx System Generator model (in simulink environment) , in which only Xilinx bolcksets of Simulink are used. now I want to calculate the conjugate of previous block's output. Is there any block for this operation? if not, can anybody help me? thank you.