Table 1.

9-norlignans, their occurrence and biological activity.

Compound	Number	Occurrence	Bioactivity	References
Yateresinol	1	Libocedrus yateensis, Cryptomerica japonica	Antifungal	[8,26]
Pachypostaudin A	2	Pachypodanthium staudtii, Pachypodanthium confine		[9,29]
Pachypostaudin B	3
Aglacin H	4	Aglaia cordata		[10]
Vitrofolal A	5	Vitex rotundifolia, Vitex negundo, Vitex cannabifolia, Syringa pinnatifolia	Antibacterial, antioxidant, cholinesterase inhibition, tyrosinase inhibitory effects, chymotrypsin inhibitory effects	[2,11,30,31,32,33,34,36]
Vitrofolal B	6
Vitrofolal E	7
Vitrofolal F	8
Descuraic Acid	9	Descurainia Sophia		[12]
Cestrumoside	10	Cestrum diurnum L.		[13]
(−)-Justiflorinol	11	Justicia patentiflora, Piper sanguineispicum		[14,38]
(+)-Virgatyne	12	Phyllantus virgatus		[15]
Arylnaphthalene	13	Pellia epiphylla, Jamesoniella autumnalis, Bazzania trilobata, Lepidozia reptans, Lepidozia incurvata, Chiloscyphus polyanthos, Jungermannia exsertifolia ssp. cordifolia		[16,40,41,42,43]
Lactone	14	Cestrum parqui	Phytotoxic effects	[17]
Compound	15	Picea abies		[18]
(+)-Imperanene	16	Imperata cylindrica, sugarcane rum distillate	Platelet aggregation inhibitory effect, tyrosinase inhibitory effect	[1,19]
3-Methoxy-Imperanene	18	Sugarcane rum distillate	Tyrosinase inhibitory effect	[19]
Noralashinol C	19	Syringa pinnatifolia		[3,4]
Noralashinol A	20
Tectonoelin A	21	Tectona grandis	Herbicidal activity	[20]
Tectonoelin B	22
Peperoteraphin	23	Peperomia tetraphylla	Cytotoxic effect	[21,22]
Cyclobutane carboxylate	24
Cyclobutane carboxylate	25
Hyperione A	26	Hypericum chinense		[23]
Hyperione B	27