Please send a picture of your NMR spectra  as jpg or pdf.

Please give infos about the solvent used for NMR samples and , very important, are your samples of aromatic hydrocarbons   PURE??

If not , you 'll obtain the NMR- spectrum of a mixture. On other part , you need an elemental analysis of your A.H.  and a standard of your A.H. Why a standard?

If you give microL (liquid or mg if solid )of your A.H. standard in your NMR tube , you can see the increase of  the related peaks in your NMR spectrum if you have a mixture.

Define the isolation of your A.H. (organs ....) when you write :

I am working on simple aromatic hydrocarbon molecules found in aquatic animals.

What a kind (s) of animals?

For your question Nr. 2:

 you please give me any online/offline tool/software where i need to put the sprectra and the calculate the structure for me.

please read this link :

http://www.nmrdb.org/

you can give in Google :  NMR prediction on line . and you 'll obtain a lot of free NMRsoftware too.

Thank you in advance for the NMR files.

JRG

There are various tool for prediction of NMR spectra, to used them you have to purchase that software, 

If you want to use without paying anything. This link would be helpful. It gave you approximate spectra prediction. 

http://www.nmrdb.org/

I hope this will solve your problem, Just match your spectrum with the predicted spectra. 

There are various tool for prediction of NMR spectra, to used them you have to purchase that software, 

If you want to use without paying anything. This link would be helpful. It gave you approximate spectra prediction. 

http://www.nmrdb.org/

I hope this will solve your problem, Just match your spectrum with the predicted spectra. 

There are various tool for prediction of NMR spectra, to used them you have to purchase that software, 

If you want to use without paying anything. This link would be helpful. It gave you approximate spectra prediction. 

http://www.nmrdb.org/

I hope this will solve your problem, Just match your spectrum with the predicted spectra. 

There are various tool for prediction of NMR spectra, to used them you have to purchase that software, 

If you want to use without paying anything. This link would be helpful. It gave you approximate spectra prediction. 

http://www.nmrdb.org/

I hope this will solve your problem, Just match your spectrum with the predicted spectra. 

http://www.nmrdb.org/

Nadeemji, thank you very much..

free and best tool: https://www.nmrdb.org

https://www.nmrdb.org

I have NMR data spectra with 13C and cosy and HQMC , no informatiom avaliable about molecular formula,

How can determine structure?. I use topspin to processing the spectra..

Anyone can help!

Khadeija Abdalla Hello, NMR will be helpful to determine structure but you might want to run a LC-MS or GC-MS to determine the molecular ion depending on the nature of your sample.

Hello Abdalla, Only NMR data does not determine the structure. It just useful for confirmation of compound formation.

If you want exact structure of your molecule, you will go for Crystal XRD or HRMS

You can use the ChemBioDraw program to determine the standard NMR for any compounds.