it could be development or authorised maps to substance type of EVMPD data related organization EV_code for the subsatance. CBD stands for Chemical/Biological Description. will specify wether substanc is Genetically Modified Organism. boolean element to specify substance is nanotechnology. boolean element to specify substance is radiopharmaceutical. link from biological source list for SIAMED to specify type of substance. this is linked to other list in EUTCT (Substance Type list) to specify case number of subsetance this is optional and can be multiples to specify molecular formula of subsetance this is optional and can be multiples to specify method of manifacture.linked to another list in EUTCT(method of manifacture) related organization for the subsatance. eutct id from organization list. link from tissue list link from species list