2 amino cycloart 1 en 3 one 1 2 chloro cycloart 1 en 3 one 1 2 hydroxy cycloart 1 en 3 one 1 2,2 dibromo cycloartan 3 one 1 2,2 dichloro cycloartan 3 one 1 2alpha azido cycloartan 3 one 1 2alpha chloro cycloartan 3 one 1 2alpha fluor cycloartan 3 one 1 2beta fluor cycloartan 3 one 1 3 benzoyl cycloart 2 ene 1 Article 1 Cycloartanes 1 Cycloartanone 1 Cytotoxicity 1 IC50 1 MCF-7 cell line 1 Synthetic derivatives 1 Tillandsia 1 Tillandsia tenuifolia 1 animal cell 1 antineoplastic agent 1 carbon nuclear magnetic resonance 1 chemical phenomena 1 chemoselectivity 1 chlorination 1 controlled study 1 cycloartane derivative 1 cycloartenone derivative 1 cytotoxicity 1 cytotoxicity assay 1