The CAS Registry Mumber 37687-14-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,7,6,8 and 7 respectively; the second part has 2 digits, 1 and 4 respectively. Calculate Digit Verification of CAS Registry Number 37687-14: (7*3)+(6*7)+(5*6)+(4*8)+(3*7)+(2*1)+(1*4)=152 152 % 10 = 2 So 37687-14-2 is a valid CAS Registry Number.