81957-87-1 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 81957-87-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,1,9,5 and 7 respectively; the second part has 2 digits, 8 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 81957-87:
(7*8)+(6*1)+(5*9)+(4*5)+(3*7)+(2*8)+(1*7)=171
171 % 10 = 1
So 81957-87-1 is a valid CAS Registry Number.
81957-87-1Relevant academic research and scientific papers
A novel synthesis of the carbapen-2-em ring system
Ratcliffe,Salzmann,Christensen
, p. 31 - 34 (2007/10/02)
A new synthesis of the carbapenem ring system, as found in thienamycin and related natural products, has been developed. The key step involves a highly efficient carbene insertion reaction which produces the bicyclic ring system by forming the N3 bond.
