anchor.diff:  
   ### Retrieve list of molecules [GET]
   
  +Returned fields:
  +
  +* totalUnfiltered, total unpaged number of molecules without filtering
  +* total, total unpaged number of molecules with filtering applied
  +* rows, array of molecules, fields of a molecule:
  +** origin, name of molecule derived from input or db lookup
  +** smiles, inchi key
  +** mol, Molfile of molecule.
  +** reactionsequence, list of reactions
  +* scans, array of scans in which the filtered molecules have fragments 
  +
   + Response 200 (application/json)
   
           {
  
positive.code: When molecule is uploaded or drawn then they can be metabolized.
  
  Form fields:
  * metabolize, Can be true==1 or false==0
  * scenario, json array of object with type and steps keys. 
  
  
negative.code: 
  Form fields:
  
  * structure_format, Can be 'smiles' or 'sdf'. See http://www.emetabolomics.org/magma/help for information on the different formats
  * structures, structures as string
  * structures_file, structures as file
  