Patent searchers have the problem, when searching for specific chemicals in patents, of trying to find all patents with Markush structures that would include their chemicals, even though these patents' indexing would not include the suitable specific compounds.
专利研究者在寻找特定的化学药品，以试图找到所有具有包括该化学药品的马库什结构的专利，即使这些专利的索引不包括适合的特定的化合物的时，会有这样的问题。