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The masses and homogeneity of ATPI-I and ATPI-II. Purified A. tenebrosa inhibitors (A) ATPI-I and (B) ATPI-II were analyzed by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI/TOF-MS). The MS spectrum of ATPI-I showed a singly charged ion of 6719.9 Da and a doubly charged ion of 3359.4 Da, while the MS spectrum of ATPI-II showed a singly charged ion of 6606.5 Da and a doubly charged ion of 3303.2 Da.
