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2-Hydroxypropyl-β-cyclodextrin functions by forming an inclusion complex with the compound being administered for easier diffusion across biological membranes, and its popularity can be attributed to its large 7 glucose unit cavity size.
H 1682 (OTTO) 2-Hydroxypropyl-β-cyclodextrin, 98% Cas 128446-35-5 - used modified cyclodextrin.