Membrane-impermeant calcium indicator that can be loaded into cells via microinjection or scrape loading.Kd: 1 uM λ Ex/λ Em (low or high [Ca2+]) = 556nm/576nm ε (556 nm) = 80,000 M-1cm-1 Orange red solid soluble in DMSO and water (pH >6) Store at 4°C and protect from light, especially in solution C40H51N7O11 MW: 806