结构性 is a noun meaning 'structural nature' or 'structural aspect', but in practice it's almost always used as a modifier before another noun — like 结构性改革 ('structural reform') or 结构性矛盾 ('structural contradiction'). The English gloss 'structural' is an adjective, so be careful: in Chinese you use 结构性 (noun) where English uses the adjective 'structural'. The full pronunciation is jiégòuxìng, though the source pinyin here only gives the first syllable.