The CAS Registry Mumber 113756-90-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,3,7,5 and 6 respectively; the second part has 2 digits, 9 and 0 respectively. Calculate Digit Verification of CAS Registry Number 113756-90: (8*1)+(7*1)+(6*3)+(5*7)+(4*5)+(3*6)+(2*9)+(1*0)=124 124 % 10 = 4 So 113756-90-4 is a valid CAS Registry Number.
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N-[N-[N-[(1,1-dimethylethoxy)carbonyl]-L-phenylalanyl]-O-(phenylmethyl)
-L-seryl]-, phenylmethyl ester