A S4 class to store the results from the ClassyFire RESTful API
metaa list of the input SMILE, InChI Key and classification version used
classificationa tibble of the ClassyFire classification results
direct_parenta list of the direct parent
alternative_parentsa tibble of alternative parents
predicted_chebia character vector of the predicted ChEBI terms
external_descriptorsa tibble of any external identificatons
descriptiona character string of the compound description