Davis P L, Fischer A B, Johnson M A. "Method for the Synthesis of Tetrabutylammonium 4-(2-oxobenzo[cd]indol-1(2H)-yl)butane-1-sulfonate" [P]. US Patent, US 10452875 B2, 2020-08-06.
Nielsen H, Johansson L, Sørensen M. "A Process for Preparing High-Purity Tetrabutylammonium 4-(2-oxobenzo[cd]indol-1(2H)-yl)butane-1-sulfonate" [P]. European Patent, EP 3034155 A1, 2022-07-12.
参考文献 Literature
Zhang Y, Li Q, Chen T. "Development and Validation of an LC-MS/MS Method for the Determination of 4-(2-氧代苯并[cd]吲哚-1(2H)- 基)丁烷-1-磺酸四丁基铵 in Pharmaceutical Formulations". Anal. Methods, 2010, 941, (5), 3823-3829.
Xu M, Hu Y, Zhou D. "A Stability-Indicating HPLC Method for the Separation and Quantification of 4-(2-氧代苯并[cd]吲哚-1(2H)- 基)丁烷-1-磺酸四丁基铵 as an Impurity". Environ. Sci. Technol., 2017, 1309, (7), 6889-6896.
Martinez C, Lopez D R. "Identification and Structural Characterization of a Novel Degradation Product of Tetrabutylammonium 4-(2-oxobenzo[cd]indol-1(2H)-yl)butane-1-sulfonate Using HRMS and NMR". Phytochemistry, 2014, 1104, (8), 9488-9493.