557757-31-0 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 557757-31-0 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 5,5,7,7,5 and 7 respectively; the second part has 2 digits, 3 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 557757-31:
(8*5)+(7*5)+(6*7)+(5*7)+(4*5)+(3*7)+(2*3)+(1*1)=200
200 % 10 = 0
So 557757-31-0 is a valid CAS Registry Number.
InChI:InChI=1/C19H27BrO7/c1-19(2)6-5-14-17(26-13-24-10-8-22-4)15(20)11-16(18(14)27-19)25-12-23-9-7-21-3/h5-6,11H,7-10,12-13H2,1-4H3
557757-31-0Relevant articles and documents
Total synthesis of atroviridin
Tisdale, Eric J.,Kochman, David A.,Theodorakis, Emmanuel A.
, p. 3281 - 3284 (2007/10/03)
A total synthesis of atroviridin (1) based on biosynthetic principles is presented. The tetracyclic xanthone structure of the natural product was constructed by coupling aryl bromide 8 with aldehyde 7 and subsequent intramolecular conjugate addition on a quinone precursor. Bromide 8 was produced from aldehyde 9 via a sequence of steps involving Baeyer-Villiger oxidation and Claisen cyclization.