Methylnaphthidate

HDMP-28

Molecular structure via molpic based on CDK

Physical properties []
Molecular mass	283.4 g/mol ^[1]
Predicted LogP	1.5 ^[1]

Structural Identifiers []
Molecular formula	C₁₈H₂₁NO₂ ^[1]
IUPAC name	methyl 2-naphthalen-2-yl-2-piperidin-2-ylacetate ^[1]
SMILES	COC(=O)C(C1CCCCN1)C2=CC3=CC=CC=C3C=C2 ^[1]
InChI	InChI=1S/C18H21NO2/c1-21-18(20)17(16-8-4-5-11-19-16)15-10-9-13-6-2-3-7-14(13)12-15/h2-3,6-7,9-10,12,16-17,19H,4-5,8,11H2,1H3 ^[1]
InChIKey	DNRNSIJBSCBESJ-UHFFFAOYSA-N ^[1]

Methylnaphthidate (also known as Schembl15655519 or NS00018064) is a substance of the naphthylaminopropane class.

Chemistry

Methylnaphthidate is a racemic mixture of the diastereomers.

Stereoisomerism
(4S,5S)-Methylnaphthidate (4R,5S)-Methylnaphthidate (4S,5R)-Methylnaphthidate (4R,5R)-Methylnaphthidate
Stereoisomer enumberation with rdkit

There are currently 4 experience reports involving methylnaphthidate on Erowid:

Canada: Methylnaphthidate is a Schedule III substance.
Germany: Methylnaphthidate is a Neuer-Psychoaktiver-Stoff under the "Neue-psychoaktive-Stoffe-Gesetz (NpSG)".
United Kingdom: Methylnaphthidate is a Class B substance.

National Center for Biotechnology Information. PubChem Compound Summary for CID 49823708, Schembl15655519. Accessed May 8, 2026. https://pubchem.ncbi.nlm.nih.gov/compound/49823708