IUPAC Name: (1-Methylpiperidin-3-yl) 2-hydroxy-2,2-diphenylacetate
Synonyms of N-Methyl-3-piperidyl benzilate (CAS NO.3321-80-0) : 1-Methylpiperidin-3-yl hydroxy(diphenyl)acetate ; Benzeneacetic acid, .alpha.-hydroxy-.alpha.-phenyl-, 1-methyl-3-piperidinyl ester ; Benzeneacetic acid, alpha-hydroxy-alpha-phenyl-, 1-methyl-3-piperidinyl ester (9CI) ; N-methyl-3-piperidyl benzilate ; 1-Methyl-3-piperidyl benzilate
InChI:InChI=1/C20H23NO3/c1-21-14-8-13-18(15-21)24-19(22)20(23,16-9-4-2-5-10-16)17-11-6-3-7-12-17/h2-7,9-12,18,23H,8,13-15H2,1H3
CAS NO:3321-80-0
Molecular Formula:C₂₀H₂₃NO₃                                           
Molecular Weight :325.4015                                                            
Molecular Structure :
EINECS: 222-033-1
Index of Refraction:1.61   
Surface Tension: 53.7 dyne/cm 
Density: 1.2 g/cm³ 
Flash Point: 205.3 °C 
Enthalpy of Vaporization: 70.54 kJ/mol 
Boiling Point: 415.9 °C at 760 mmHg 
Vapour Pressure: 1.16E-07 mmHg at 25°C

 N-Methyl-3-piperidyl benzilate (CAS NO.3321-80-0) is an anticholinergic drug related to the chemical warfare agent 3-Quinuclidinyl benzilate.

Poison by intravenous and intraperitoneal routes. When heated to decomposition it emits toxic fumes of NO_x. See also ESTERS.

 N-Methyl-3-piperidyl benzilate (CAS NO.3321-80-0) is less potent and shorter acting than 3-quinuclidyl benzilate, but like 3-QNB its effects on the central nervous system predominate over peripheral effects. It produces deliriant and hallucinogenic effects similar to those of plants such as datura and may be used recreationally at low doses, however unpleasant side effects such as dysphoria, nausea and vomiting, dizziness and extreme dry mouth tend to make abuse of these kind of drugs uncommon. Both the N-methyl and N-ethyl analogues of 3-piperidyl benzilate are however Schedule I controlled drugs.

Radiolabelled versions of N-Methyl-3-piperidyl benzilate (CAS NO.3321-80-0) are used in scientific research to map the distribution of muscarinic acetylcholine receptors in the brain.