The CAS Registry Mumber 37767-42-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,7,7,6 and 7 respectively; the second part has 2 digits, 4 and 2 respectively. Calculate Digit Verification of CAS Registry Number 37767-42: (7*3)+(6*7)+(5*7)+(4*6)+(3*7)+(2*4)+(1*2)=153 153 % 10 = 3 So 37767-42-3 is a valid CAS Registry Number.
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