The CAS Registry Mumber 142166-04-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,4,2,1,6 and 6 respectively; the second part has 2 digits, 0 and 4 respectively. Calculate Digit Verification of CAS Registry Number 142166-04: (8*1)+(7*4)+(6*2)+(5*1)+(4*6)+(3*6)+(2*0)+(1*4)=99 99 % 10 = 9 So 142166-04-9 is a valid CAS Registry Number.
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2-[[(3,4-dihydro-2H-1,4-benzoxazin-7-yl)carbonyl]amino]-, dimethyl
ester, (S)-