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220505-13-5

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220505-13-5 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 220505-13-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,2,0,5,0 and 5 respectively; the second part has 2 digits, 1 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 220505-13:
(8*2)+(7*2)+(6*0)+(5*5)+(4*0)+(3*5)+(2*1)+(1*3)=75
75 % 10 = 5
So 220505-13-5 is a valid CAS Registry Number.

220505-13-5Downstream Products

220505-13-5Relevant articles and documents

The enzymatic synthesis of isotopically labelled penicillin Ns with isopenicillin N synthase

Baldwin, Jack E.,Adlington, Robert M.,Crouch, Nicholas P.,Pereira, Ines A.C.

, p. 1145 - 1163 (1998)

The preparation of isotopically labelled penicillin Ns using a chemico-enzymatic approach is described. This route involves the chemical synthesis of variously labelled D,L,D,-aminoadipoyl-cysteinyl-valine tripeptides via well established facile protocols and concludes with the conversion of these tripeptides directly into penicillin Ns by the action of recombinant isopenicillin N synthase. Milligram quantities of isotopically labelled penicillin Ns, which would otherwise represent very challenging and expensive synthetic targets, are readily accessible from this route.

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