The CAS Registry Mumber 377067-08-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 3,7,7,0,6 and 7 respectively; the second part has 2 digits, 0 and 8 respectively. Calculate Digit Verification of CAS Registry Number 377067-08: (8*3)+(7*7)+(6*7)+(5*0)+(4*6)+(3*7)+(2*0)+(1*8)=168 168 % 10 = 8 So 377067-08-8 is a valid CAS Registry Number.