87996-81-4 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 87996-81-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,7,9,9 and 6 respectively; the second part has 2 digits, 8 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 87996-81:
(7*8)+(6*7)+(5*9)+(4*9)+(3*6)+(2*8)+(1*1)=214
214 % 10 = 4
So 87996-81-4 is a valid CAS Registry Number.
87996-81-4Relevant articles and documents
Synthesis of 2-oxo-penams and penems from penicillin G
Ghosez,Marchand-Brynaert,Vekemans,et al.
, p. 2493 - 2503 (2007/10/02)
Using Penicillin G as starting material, general methods of synthesis for the 2-oxo-penam skeleton have been established. Compounds 7 represent a new group of strained penicillin derivatives. They can be readily transformed into 2-alkoxy 17 or benzoyloxypenems 18.
