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NA, which stands for Not Applicable or Not Available, is a term used in chemical contexts to indicate that a certain chemical compound or ingredient is not relevant to the specific situation or is not present in a particular product or sample. It may also be used when the exact composition of a chemical is not known or is not disclosed for proprietary reasons. NA serves as a placeholder for information related to chemicals and their properties in various scientific and industrial contexts.
Usage:
Used in Chemical Analysis:
NA is used as a placeholder for [chemical compound or ingredient] when it is not relevant to the specific situation or is not present in a particular product or sample.
Used in Product Labeling:
NA is used as an indicator for [chemical composition] when the exact composition is not known or is not disclosed for proprietary reasons.
Used in Research and Development:
NA is used as a placeholder for [chemical information] when the exact properties or composition of a substance are not yet determined or are being kept confidential for research purposes.
Used in Regulatory Compliance:
NA is used as a compliance marker for [chemical ingredients] when a product or sample does not contain a specific chemical compound or ingredient, ensuring transparency and adherence to regulations.

145143-40-4

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145143-40-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 145143-40-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,4,5,1,4 and 3 respectively; the second part has 2 digits, 4 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 145143-40:
(8*1)+(7*4)+(6*5)+(5*1)+(4*4)+(3*3)+(2*4)+(1*0)=104
104 % 10 = 4
So 145143-40-4 is a valid CAS Registry Number.

145143-40-4Relevant academic research and scientific papers

Use of Hydrogen Bonds to Control Molecular Aggregation. Behavior of a Self-Complementary Dipyridone Designed to Self-Replicate

Persico, Francois,Wuest, James D.

, p. 95 - 99 (2007/10/02)

In principle, the simple dipyridone 4 encodes enough chemical information to allow it to self-replicate by acting as a template for the assembly and controlled oxidative coupling of ethynylpyridone subunits 5 and 6.This could occur by the formation of ter

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