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.

Input: Consider Input: Two pharmacologically distinct alpha 1-adrenoceptor subtypes in the contraction of rabbit aorta: each subtype couples with a different Ca2+ signalling mechanism and plays a different physiological role.

Output: Ca2+


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

Output: lactose


Input: Consider Input: Role of oestrogen receptors on the modulation of NADPH-diaphorase-positive cell number in supraoptic and paraventricular nuclei of ovariectomised female rats.


Output: oestrogen