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128256-91-7

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128256-91-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 128256-91-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,8,2,5 and 6 respectively; the second part has 2 digits, 9 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 128256-91:
(8*1)+(7*2)+(6*8)+(5*2)+(4*5)+(3*6)+(2*9)+(1*1)=137
137 % 10 = 7
So 128256-91-7 is a valid CAS Registry Number.

128256-91-7Relevant articles and documents

REACTIONS WITH 2-THIOHYDANTOIN DERIVATIVES: SYNTHESIS OF MANNICH BASES AND IMIDAZOTHIAZOLE DERIVATIVES

Abdelaziz, Mahfouz A.,Riad, Bahia Y.

, p. 303 - 309 (2007/10/02)

5-Arylidene-2-thiohydantoins (1a-c) and 5-arylazo-1-phenyl-2-thiohydantoins (7a,b) were condensed with formaldehyde and primary or secondary aromatic amines to give the corresponding Mannich bases (2a-f) and 8a, b) respectively, which could also be conver

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