552890-50-3 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 552890-50-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 5,5,2,8,9 and 0 respectively; the second part has 2 digits, 5 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 552890-50:
(8*5)+(7*5)+(6*2)+(5*8)+(4*9)+(3*0)+(2*5)+(1*0)=173
173 % 10 = 3
So 552890-50-3 is a valid CAS Registry Number.
552890-50-3Relevant articles and documents
Synthesis of JKLM ring fragment of ciguatoxin via acetylene-cobalt strategy
Baba, Takayuki,Isobe, Minoru
, p. 547 - 551 (2007/10/03)
A stereoselective synthesis of the JKLM ring fragment has been achieved through a coupling between two segments via heteroconjugate addition, seven-membered ether ring formation mediated by an acetylene cobalt complex and spiroketalization reaction.