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21056-59-7

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21056-59-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 21056-59-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,1,0,5 and 6 respectively; the second part has 2 digits, 5 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 21056-59:
(7*2)+(6*1)+(5*0)+(4*5)+(3*6)+(2*5)+(1*9)=77
77 % 10 = 7
So 21056-59-7 is a valid CAS Registry Number.

21056-59-7Relevant articles and documents

QUANTITATIVE SEPARATION AND ANALYSIS OF DIASTEREOMERS OF L-METHIONINE-S,R-SULFOXIMINE VIA CYCLIC N-BLOCKED DERIVATIVES

Sugiyama, Yuichi,Wedler, Frederick C.

, p. 1471 - 1474 (2007/10/02)

The diastereomers of L-methionine-S,R-sulfoximine, blocked at α-N with phthaloyl, then cyclized with Ac2O to form 3,4,5,6-tetrahydro-1-methyl-3-oxo-4-(N-phthalimido)-1,2-thiazine-1-oxide, could be easily separated by fractional crystallization or HPLC, whereas the parent compounds were very difficult to separate.

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