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128308-68-9

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128308-68-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 128308-68-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,8,3,0 and 8 respectively; the second part has 2 digits, 6 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 128308-68:
(8*1)+(7*2)+(6*8)+(5*3)+(4*0)+(3*8)+(2*6)+(1*8)=129
129 % 10 = 9
So 128308-68-9 is a valid CAS Registry Number.

128308-68-9Relevant articles and documents

Cyclic Guanidines; III. Synthesis of Novel 8,13,15-Triazasteroids and Related Heterocycles

Esser, Franz,Pook, Karl-Heinz,Carpy, Alain

, p. 72 - 78 (2007/10/02)

The Pictet-Spengler reaction is utilized for the generation of 8,13,15-triazasteroids and related multicyclic compounds.The constitution of 7a is elucidated by NMR- and X-ray analysis.A second route to the triazasteroid ring system by Bischler-Napieralski type cyclization is disclosed.Synthetic alternatives as well as the variability in size and nature of rings A, B, C and D of the steroid-like skeletons are demonstrated.Synthesis covers 14 new tetra- and pentacyclic compounds on the basis of 9 novel ring systems.

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