The CAS Registry Mumber 76527-49-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,6,5,2 and 7 respectively; the second part has 2 digits, 4 and 9 respectively. Calculate Digit Verification of CAS Registry Number 76527-49: (7*7)+(6*6)+(5*5)+(4*2)+(3*7)+(2*4)+(1*9)=156 156 % 10 = 6 So 76527-49-6 is a valid CAS Registry Number.