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Stability study of [18F]RSA at 37 °C; a) 0 min; b) 1h; c) 2h; d) 4h. HPLC conditions: Agilent Zorbax GF-250 4.6 x 250 mm, PBS (1X, pH 7.4), flow: 0.3 ml/min; red line, in-line radiodetector; blue line, UV detector at 254 nm.