https://researchportal.helsinki.fi/sv/publications/formation-of-crown-structure-in-scots-pine-trees/
Formation of crown structure in Scots pine trees - Helsingfors universitet
crown structurescots pineformationtreeshelsingfors
https://webbook.nist.gov/cgi/inchi?Str3View=C33100275&Type=JSmol
Structure for 15-Crown-5
structurecrown