"Chemical A has parent hydride Chemical B if there exists a molecular graphical transformation where functional groups on A are replaced with hydrogens in order to yield B." . "2023-03-18T23:49:31Z"^^ . . . . . "has parent hydride"@en . "obo:chebi#has_parent_hydride" . . "pyranine (CHEBI:52083) has parent hydride pyrene (CHEBI:39106). Pyrene is molecule with four fused benzene rings, whereas pyranine has the same core ring structure with additional sulfates." . .