Composition #8: ZOBEL, AM., WANG, JY., MARCH, RE., BROWN, SA. IDENTIFICATION OF 8 COUMARINS OCCURRING WITH PSORALEN, XANTHOTOXIN, AND BERGAPTEN ON LEAF SURFACES. journal of chemical ecology, 1991, vol. 17, no. 9, p. 1859–1870. DOI: 10.1007/BF00993733.
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