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138279-28-4

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138279-28-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 138279-28-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,8,2,7 and 9 respectively; the second part has 2 digits, 2 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 138279-28:
(8*1)+(7*3)+(6*8)+(5*2)+(4*7)+(3*9)+(2*2)+(1*8)=154
154 % 10 = 4
So 138279-28-4 is a valid CAS Registry Number.

138279-28-4Relevant articles and documents

Process for preparing 1,4 dihydropyridine compounds

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, (2008/06/13)

A 1,4-dihydropyridine derivative represented by formula (I): STR1 wherein X represents an alkyl group, or a group of STR2 in which R1, R2, and R3 may be the same or different and each represent a hydrogen atom, a halogen atom, a nitro group, a nitrile group, or a trifluoromethyl group; R4 represents a substituted or unsubstituted acyloxymethyl group, an alkoxycarbonyloxymethyl group, a (2-oxo-1,3-dioxolen-4 -yl)methyl group, a (5-substituted-2-oxo-1,3-dioxolen-4 -yl)methyl group, or an acyl group; R5 represents a lower alkyl group or a substituted alkyl group; and R6 represents a hydrogen atom, a lower alkoxymethyl group, or a lower acyloxymethyl group, is disclosed. The compound is stereospecifically hydrolyzed by the action of an enzyme to provide an optically active 1,4-dihydro -3-pyridinemonocarboxylic acid which is useful as an intermediate of pharmaceuticals in good optical purity and yield.

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