The CAS Registry Mumber 90476-36-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,0,4,7 and 6 respectively; the second part has 2 digits, 3 and 6 respectively. Calculate Digit Verification of CAS Registry Number 90476-36: (7*9)+(6*0)+(5*4)+(4*7)+(3*6)+(2*3)+(1*6)=141 141 % 10 = 1 So 90476-36-1 is a valid CAS Registry Number.