Assertion: chlorophyll | /r/HasProperty | following components
Facets:
value: chemically
type: MANNER
Source sentences:
text: Chemically, then, chlorophyll is composed of the following components: A nucleus of porphyrin (tetrapyrrole) that contains a chelated magnesium atom - The porphyrin head of the structure is composed of four rings of pyrrole with nitrogen arranged in a ring