Zinquin is an UV-excitable, blue fluorescent zinc indicator. Zinquin ethyl ester is membrane-permeable and is hydrolyzed into Zinquin free acid once entering cells. Zinc is believed to be involved in the suppression of apoptosis and thought to play important roles in many neural activities.    &lamba;Ex/λEm (with Zn2 )= 364/385 nm  Off-white solid soluble in DMSO  Store at 4°C and protect from light  C21H22N2O5S  MW: 414.48.  [181530-09-6]