The CAS Registry Mumber 57490-91-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,7,4,9 and 0 respectively; the second part has 2 digits, 9 and 1 respectively. Calculate Digit Verification of CAS Registry Number 57490-91: (7*5)+(6*7)+(5*4)+(4*9)+(3*0)+(2*9)+(1*1)=152 152 % 10 = 2 So 57490-91-2 is a valid CAS Registry Number.
Synthesis of 2-carbalkoxyamino-5(6)-(1-substituted piperazin-4-yl/piperazin-4-ylcarbonyl)benzimidazoles and related compounds as potential anthelmintics
Abuzar,Sharma
, p. 747 - 749 (2007/10/02)
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