Benzene - Wikipedia

Benzene is an important organic chemical compound with the chemical formula C 6 H 6.The benzene molecule is composed of six carbon atoms joined in a ring with one hydrogen atom attached to each. As it contains only carbon and hydrogen atoms, benzene is classed as a hydrocarbon.. Benzene is a natural constituent of crude oil and is one of the elementary petrochemicals.

Porphyrin - Wikipedia

Porphyrins (/ ˈ p ɔːr f ər ɪ n / POR-fər-in) are a group of heterocyclic macrocycle organic compounds, composed of four modified pyrrole subunits interconnected at their α carbon atoms via methine bridges (=CH−). The parent porphyrin is porphine, a rare chemical compound of exclusively theoretical interest.Substituted porphines are called porphyrins. With a total of 26 π-electrons

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