MK 0557

CAS NO.：328232-95-7
Empirical Formula: C22H19FN4O3
Molecular Weight: 406.41
MDL number: MFCD25976714
SAFETY DATA SHEET (SDS)
Update Date: 2026-05-28 01:08:10

What is MK 0557?

Description

MK-0557 is a potent antagonist of the neuropeptide Y (NPY) receptor Y₅ (K_is = 1.3, 0.79, 0.74, and 1.4 nM for human, rhesus monkey, mouse, and rat receptors, respectively). It is >7,500-fold selective for Y₅ over other receptors and lacks activity in a panel of 180 receptors, enzymes, and ion channels at concentrations up to 1 μM. MK-0557 increases intracellular calcium in CHO cells expressing the human Y₅ receptor in a concentration-dependent manner. In vivo, MK-0557 (30 mg/kg) reduces body weight gain in wild-type and diet-induced obese mice. It also reduces retroperitoneal fat pad weight, epididymal and mesenteric fat pad weights, leptin levels, and food intake in lean mice fed a high-fat diet.

Properties of MK 0557

Melting point:	240.0-240.6 °C
Boiling point:	708.7±60.0 °C(Predicted)
Density	1.46±0.1 g/cm3(Predicted)
storage temp.	Store at -20°C
solubility	DMF: 5 mg/ml; DMF:PBS(pH 7.2)(1:1): 0.5 mg/ml; DMSO: 3 mg/ml
form	A crystalline solid
pka	13.40±0.20(Predicted)
color	White to off-white

Safety information for MK 0557

Signal word	Warning
Pictogram(s)	Exclamation Mark Irritant GHS07
GHS Hazard Statements	H302:Acute toxicity,oral H315:Skin corrosion/irritation H319:Serious eye damage/eye irritation H335:Specific target organ toxicity, single exposure;Respiratory tract irritation
Precautionary Statement Codes	P261:Avoid breathing dust/fume/gas/mist/vapours/spray. P264:Wash hands thoroughly after handling. P264:Wash skin thouroughly after handling. P270:Do not eat, drink or smoke when using this product. P271:Use only outdoors or in a well-ventilated area. P280:Wear protective gloves/protective clothing/eye protection/face protection. P330:Rinse mouth. P362:Take off contaminated clothing and wash before reuse. P301+P312:IF SWALLOWED: call a POISON CENTER or doctor/physician IF you feel unwell. P302+P352:IF ON SKIN: wash with plenty of soap and water. P304+P340:IF INHALED: Remove victim to fresh air and Keep at rest in a position comfortable for breathing. P305+P351+P338:IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing. P332+P313:IF SKIN irritation occurs: Get medical advice/attention. P337+P313:IF eye irritation persists: Get medical advice/attention. P405:Store locked up. P403+P233:Store in a well-ventilated place. Keep container tightly closed. P501:Dispose of contents/container to..…