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(A) blank rat intestinal microflora suspension;(B) blank rat intestinal microflora suspension spiked with 20(S)-Rh2 (100 nM), 20(R)-Rh2 (100 nM), 20(S)-Ppd (1 µM), 20(R)-Ppd (1 µM) and digitoxin (500 nM);(C) rat intestinal microflora suspension after incubation with 1 µM 20(S)-Rh2 for 1 h.
