Narcotoline is an opiate alkaloid chemically related to noscapine. It binds to the same receptors in the brain as noscapine to act as an antitussive,^[1] and has also been used in tissue culture media.^[2]

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Narcotoline

Names
Preferred IUPAC name (3S)-3-[(5R)-4-Hydroxy-6-methyl-5,6,7,8-tetrahydro-2H-[1,3]dioxolo[4,5-g]isoquinolin-5-yl]-6,7-dimethoxy-2-benzofuran-1(3H)-one
Identifiers
CAS Number	521-40-4 Y
3D model (JSmol)	Interactive image
ChemSpider	390785 N
ECHA InfoCard	100.007.559
EC Number	208-313-6
KEGG	C09593 N
PubChem CID	442330
UNII	M5V1K1QE3F Y
CompTox Dashboard (EPA)	DTXSID50200098
InChI InChI=1S/C21H21NO7/c1-22-7-6-10-8-13-20(28-9-27-13)17(23)14(10)16(22)18-11-4-5-12(25-2)19(26-3)15(11)21(24)29-18/h4-5,8,16,18,23H,6-7,9H2,1-3H3/t16-,18+/m1/s1 N Key: LMGZCSKYOKDBES-AEFFLSMTSA-N N InChI=1/C21H21NO7/c1-22-7-6-10-8-13-20(28-9-27-13)17(23)14(10)16(22)18-11-4-5-12(25-2)19(26-3)15(11)21(24)29-18/h4-5,8,16,18,23H,6-7,9H2,1-3H3/t16-,18+/m1/s1 Key: LMGZCSKYOKDBES-AEFFLSMTBE
SMILES CN1CCC2=CC3=C(C(=C2[C@@H]1[C@@H]4C5=C(C(=C(C=C5)OC)OC)C(=O)O4)O)OCO3
Properties
Chemical formula	C21H21NO7
Molar mass	399.399 g·mol−1
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). N verify (what is YN ?) Infobox references

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It can be obtained from the opium poppy, Papaver somniferum. It is present at much higher levels in culinary strains (cultivars) of P. somniferum used for poppy seed production than in high-morphine pharmaceutical strains used for opium production.^[3]