Composition #1: Jakupovic, J., Chau-Thi, T. V., Warning, U., Bohlmann, F., Greger, H. 11β,13-Dihydroguaianolides from Artemisia douglasiana and a thiophene acetylene from A. schmidtiana.. Phytochemistry, 1986, vol. 25, no. 7, p. 1663–7. DOI: 10.1016/S0031-9422(00)81231-5.
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