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In a test on hydrolysis as a function of pH significant hydrolysis was only observed at pH 9 and an elevated temperature of 50°C. The determined half-life (pseudo first-order) at 50°C was 2.99 days. Half-lives and rate constants determined at pH 9 and more moderate temperatures of 20 and 30 °C were not significantly non-zero (166 and 195 days, respectively). Thus, at environmentally relevant conditions hydrolysis is expected to be rather slow.