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198016-10-3

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198016-10-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 198016-10-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,9,8,0,1 and 6 respectively; the second part has 2 digits, 1 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 198016-10:
(8*1)+(7*9)+(6*8)+(5*0)+(4*1)+(3*6)+(2*1)+(1*0)=143
143 % 10 = 3
So 198016-10-3 is a valid CAS Registry Number.

198016-10-3Relevant articles and documents

A New Generation of "Cholaphanes": Steroid-Derived Macrocyclic Hosts with Enhanced Solubility and Controlled Flexibility

Bhattarai, Khadga M.,Davis, Anthony P.,Perry, Justin J.,Walter, Christopher J.,Menzer, Stephan,Williams, David J.

, p. 8463 - 8473 (2007/10/03)

The macrocyclic "cholaphanes" 3a - c were synthesized from the inexpensive steroid cholic acid. Like earlier relatives they feature substantial cavities with inward-directed hydroxyl groups, suitable for binding polar molecules such as carbohydrates in nonpolar media. New features are the externally directed alkyl chains, promoting solubility in organic solvents, and (in the case of 3b/c) reduced conformational freedom resulting from truncation of the steroidal side-chain. In particular, modeling shows that the smallest macrocycle 3c possesses very little flexibility, preferring an open conformation which is also revealed in the X-ray crystal structure of its pentahydrate. NMR studies indicated that all three cholaphanes form 1:1 complexes with octyl β-D-glucoside in CDCl3, with Ka = 600-1560 M-1. Cholaphanes 3b/c proved able to extract methyl β-D-glucoside from aqueous solutions into CHCl3. The transport of methyl β-D-glucoside across a chloroform barrier was also demonstrated for 3c.

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