The CAS Registry Mumber 202993-88-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,0,2,9,9 and 3 respectively; the second part has 2 digits, 8 and 8 respectively. Calculate Digit Verification of CAS Registry Number 202993-88: (8*2)+(7*0)+(6*2)+(5*9)+(4*9)+(3*3)+(2*8)+(1*8)=142 142 % 10 = 2 So 202993-88-2 is a valid CAS Registry Number.
Synthesis of 2-(hydroxyymethyl)-1β-methylcarbapenem. Chemoselective organometallic addition to 3-substituted 4-[(R)-1-carboxyethyl]azetidin-2- one
Hu,Demuth T.P.
, p. 1719 - 1723 (2007/10/03)
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