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136569-53-4

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136569-53-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 136569-53-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,6,5,6 and 9 respectively; the second part has 2 digits, 5 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 136569-53:
(8*1)+(7*3)+(6*6)+(5*5)+(4*6)+(3*9)+(2*5)+(1*3)=154
154 % 10 = 4
So 136569-53-4 is a valid CAS Registry Number.

136569-53-4Relevant articles and documents

Enantiocontrolled Total Syntheses of (-)-Physovenine and (-)-Physostigmine

Takano, Seiichi,Moriya, Minoru,Ogasawara, Kunio

, p. 5982 - 5984 (2007/10/02)

Enantiocontrolled total syntheses of the Calabar bean alkaloid (-)-physovenine (1) and (-)-physostigmine (2) have been achieved in a concise manner starting from the optically active tricyclic enone 3 employing a Fischer indolization reaction under nonacidic conditions as the key step.

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