PubChem for starters.

you could put it into scifinder and run a similarity search. That would yield a list of related derivatives.

Greetings

Christoph

You can do a chemical structure or substructure search using PubChem.

http://pubchem.ncbi.nlm.nih.gov/search/search.cgi#

Hi Shawn 

if you have the Mass Spec data you can use these databases to try and find related molecules. 

https://xcmsonline.scripps.edu/

http://gnps.ucsd.edu/ProteoSAFe/static/gnps-splash.jsp

Give me a shout if you want to chat more. 

I have a structure and name, pubchem was helpful, i will try scifinder, thanks!