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relación estructura-actividad
chem.	Struktur-Wirkungs-Beziehung f
environ.	Struktur-Wirkung-Beziehung f
R&D., chem.	Struktur-Aktivitätsbeziehungen f
relación estructura/actividad
med., pharma., chem.	Struktur/Aktivitäts-Beziehung f

relación estructura-actividad: 3 phrases in 2 subjects

Chemistry	1
Natural sciences	2