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database nanomaterials ambit predictive toxicology qsar chemical landscape activity cliffs tautomers tautomer generation cheminformatics toxtree echa web services opentox toxcast safety tallinn models toxicology qsar2012 data uniform resource identifier application programming interface chemical database chemical similarity molecular similarity data mining resource description framework rdf ontology nanomaterial standardisation rest api biological effects physicochemical characterisation parser chemcial structures experimental data data sharing substance identity databases metabolism smirks visualisation bioclipse machine learning model euroqsar2012 euroqsar multilabel classification rest