ACEI	angiotensin-converting enzyme inhibitor
Ala	alanine
BCS	Biopharmaceutics Classification System
bPMMA	basic butylated methacrylate copolymer
CRS	chemical reference standard
CV	coefficient of variation
DKP	diketopiperazine derivative
DSC	Dynamic Scanning Calorimetry
DTG	Derivative Thermogravimetric Analysis
EM	enalapril maleate
ENP	enalapril
FDM	Fused Deposition Modeling
FT-IR	Fourier transform-infrared spectroscopy
HME	hot melt extrusion
HPLC	High Performance Liquid Chromatography
HPMC	hydroxypropyl methyl cellulose, hypromellose
Imp	impurity
K	Kollidon
LOD	limit of detection
LOQ	limit of quantification
PF	Pyrogen-free
Phe	phenylalanine
Pro	proline
SD	standard deviation
SEM	Scanning Electron Microscopy
SiO2	fumed silica
SOL	Soluplus
Tg	glass transition temperature
TGA	thermogravimetric analysis
VA	poly(vinylpyrrolidone-vinyl acetate)-copolymer
WHO	World Health Organization