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... OPYR ... (257 elements)

ALGOPYRIN · FAGOPYRISM · FAGOPYRISME · FAGOPYRUM · GLUCOPYRANOSYL · LEUCOPYRITE · METHYLGLUCOPYRANOSIDES · OLIGOPYRIMIDIQUE · PARACOPYRIGHT · THIOGLUCOPYRANOSIDES

... ROPY ... (334 elements)

ECTROPY · ELECTROPYREXIE · KENTROPYX · KENTROPYXI · NOOTROPYL · OSTROPYSKI · PIKRYLAMINODINITROPYRIDIN · ROPY · SOCIOTROPY · TROPY

... CROPYR ... (3 elements)

MACROPYRAMID · MICROPYROPSIS · MICROPYRUM

... DROPYR ... (12 elements)

DIHYDROPYRAAN · DIHYDROPYRIDIN · DIHYDROPYRIDINE · DIHYDROPYRIDINES · DIHYDROPYRIDINSYNTHESE

... EROPYR ... (6 elements)

AEROPYRUM · MIEROPYRUM · PARAPTEROPYRUM · PTEROPYRUM · SCLEROPYRUM

... GROPYR ... (6 elements)

AGROPYRON · AGROPYROPSIS

... OROPYR ... (2 elements)

CHLOROPYRAMINE · SULFACHLOROPYRIDAZINE

... PROPYR ... (5 elements)

ASPROPYRGOS · PROPYRRHURA · SAPROPYRE

... ROPYRA ... (5 elements)

CHLOROPYRAMINE · DIHYDROPYRAAN · MACROPYRAMID · TETRAHYDROPYRAAN · TETRAHYDROPYRAN

... ROPYRE ... (3 elements)

ELECTROPYREXIE · OCHROPYRE · SAPROPYRE

... ROPYRI ... (11 elements)

DIHYDROPYRIDIN · DIHYDROPYRIDINE · DIHYDROPYRIDINES · DIHYDROPYRIDINSYNTHESE · DIHYDROPYRIMIDINE

... ROPYRO ... (7 elements)

AGROPYRON · AGROPYROPSIS · MICROPYROPSIS

... ROPYRU ... (7 elements)

AEROPYRUM · MICROPYRUM · MIEROPYRUM · PARAPTEROPYRUM · PTEROPYRUM

... TROPYR ... (2 elements)

ELECTROPYREXIE · PIKRYLAMINODINITROPYRIDIN