133156-39-5 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 133156-39-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,3,1,5 and 6 respectively; the second part has 2 digits, 3 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 133156-39:
(8*1)+(7*3)+(6*3)+(5*1)+(4*5)+(3*6)+(2*3)+(1*9)=105
105 % 10 = 5
So 133156-39-5 is a valid CAS Registry Number.
133156-39-5Relevant articles and documents
Non-lithiation route to naturally occuring 5,7-dimethoxyphthalide
Kumaran, G.,Kulkarni, G. H.
, p. 436 - 437 (2007/10/02)
A non-lithiation route has been described for the synthesis of naturally occurring 5,7-dimethoxyphthalide (10) starting from ethyl orsellinate (1) involving simple reactions and less expensive reagents.