The information in a structured ORD record is not guaranteed to be a proper subset of its free text description, as some information in the structured ORD record is derived from elsewhere, and in this work denoted "implicit information". For example, the reaction roles of compounds are rarely stated in a reaction's text description. As another example, the text description may indicate a filtration step (mapping to a ReactionWorkup of type FILTRATION in its ORD record) but does not include "filter" or "filtration" explicitly, e.g., "passing through celite". We consider this kind of implicit information learnable and therefore do not exclude them from ORD records. On the other hand, some implicit information is considered unlearnable and thus excluded from the ORD records. Specifically,