L-Proline,1-[[dodecahydro-6,9-bis(methylene)-2-oxoazuleno[4,5-b]furan-3-yl]methyl]-,[3R-(3a,3aa,6aa,9aa,9bb)]-; Azuleno[4,5-b]furan, L-proline deriv.;Involucratine; Saussureamine B
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