Molecular computing: logic gate

This is pretty neat: it's a molecular logic gate. It senses pH, sodium concentration, and zinc concentration, and if all three are present, it fluoresces. I just found the concept to be pretty clever. The molecule looks like this:

J. Am. Chem. Soc., 2006, 128 (15), pp 4950–4951

DOI: 10.1021/ja058295+