A new photocleavable analog of BAPTA chelating ligand has a high affinity towards Ca2+ ions (K= 2.5*106 M−1). The use of photolabile 3-(hydroxymethyl)-2-naphthol core in the design of photo-BAPTA allows for the efficient (Φ=0. 63) and very fast (τ <12 μs) release of Ca2+ ions upon 300 or 350 nm irradiation.
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