In this task, you are given a sentence. You are expected to recognize the name of any form of chemical substances. Although there might be several correct answers, you need to write one of them.

Ex Input:
Anti-apoptotic cardioprotective effects of SHP-1 gene silencing against ischemia-reperfusion injury: Use of deoxycholic acid-modified low molecular weight polyethyleneimine as a cardiac siRNA-carrier.

Ex Output:
polyethyleneimine


Ex Input:
Activity-dependent cleavage of brain glutamic acid decarboxylase 65 by calpain.

Ex Output:
glutamic acid


Ex Input:
Intestinal permeability and lactose hydrolysis in human rotaviral gastroenteritis assessed simultaneously by non-invasive differential sugar permeation.

Ex Output:

lactose