The CAS Registry Mumber 1891-42-5 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 1,8,9 and 1 respectively; the second part has 2 digits, 4 and 2 respectively. Calculate Digit Verification of CAS Registry Number 1891-42: (6*1)+(5*8)+(4*9)+(3*1)+(2*4)+(1*2)=95 95 % 10 = 5 So 1891-42-5 is a valid CAS Registry Number.
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(01090595) Hulupinicacid primary pharmaceutical reference standard