The CAS Registry Mumber 90476-37-2 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 7 respectively. Calculate Digit Verification of CAS Registry Number 90476-37: (7*9)+(6*0)+(5*4)+(4*7)+(3*6)+(2*3)+(1*7)=142 142 % 10 = 2 So 90476-37-2 is a valid CAS Registry Number.