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Natural pigments containing four pyrrole rings joined by one-carbon units linking position 2 of one pyrrole ring to position 5 of the next, 2,5-asendites ühendatud nelja pürrooltsüklit sisaldavad looduslikud pigmendid
tetrapürroolid . Keemiaterminite baas. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//kem/tetrap%C3%BCrroolid/1/est (03.08.2026)
