Question: The drug JTV519 is derivative of which group of chemical compounds?

Context:
In these conditions, JTV519 (K201), a 1,4-benzothiazepine derivative and multi-channel blocker, stabilizes RyR2s and decrease SR Ca²⁺ leak.
The 1,4-benzothiazepine derivative JTV519, and the more specific derivative S107 (2,3,4,5,-tetrahydro-7-methoxy-4-methyl-1,4-benzothiazepine), are thought to improve skeletal muscle function by stabilizing the RyR1-FKBP12 complex.
In this article, we synthesize derivatives of the channel activator 4-chloro-3-methyl phenol (4-CmC) and the 1,4-benzothiazepine channel inhibitor 4-[-3{1-(4-benzyl) piperidinyl}propionyl]-7-methoxy-2,3,4,5-tetrahydro-1,4-benzothiazepine (K201, JTV519) with enhanced electron donor properties.
K201 (JTV519), a benzothiazepine derivative, has been shown to possess anti-arrhythmic and cardioprotective properties, but the mechanism of its action is both complex and controversial.
K201 (JTV519) is a 1,4-benzothiazepine derivative that exhibits a strong cardioprotective action and acts as a multiple-channel blocker, including as a K+ channel blocker.
A derivative of 1,4-benzothiazepine (JTV519) increased the affinity of calstabin2 for RyR2, which stabilized the closed state of RyR2 and prevented the Ca2+ leak that triggers arrhythmias.
We report that a new drug, the 1,4-benzothiazepine derivative JTV519, reverses this pathogenic process. JTV519 is known to have a protective effect against Ca2+ overload-induced myocardial injury.
In conclusion, JTV519, a new 1,4-benzothiazepine derivative, corrected the defective channel gating in RyR (increase in both the rapid conformational change and the subsequent Ca(2+) release rate) in HF.
A newly synthesized 1,4-benzothiazipine derivate, 4-[3-(4-benzylpiperidin-1-yl) propionyl]-7-methoxy-2,3,4,5-tetrahydro-1, 4-benzothiazepine monohydrochloride (JTV-519) was examined for its ability to reverse P-glycoprotein (P-gp) and multidrug resistance protein 1 (MRP1) mediated multidrug resistance (MDR) in K562/MDR and KB/MRP cells, respectively. 
JTV-519, which has potential use as an antiarrhythmic [285800]. The drug is a novel cardioprotectant derivative of 1,4-benzothiazepine for which phase I trials were completed in the third quarter of 1998
The 1,4-benzothiazepine derivative JTV-519 is a new type of calcium ion channel modulator.
A new 1,4-benzothiazepine derivative, JTV519 (JTV), has strong protective effects against isoproterenol-induced myocardial injury. 
A newly synthesized benzothiazepine derivative, JTV-519 (JT) has been reported to be cardioprotective.
Protective effect of JTV519, a new 1,4-benzothiazepine derivative, on prolonged myocardial preservation
A new 1,4-benzothiazepine derivative, JTV519, has a strong protective effect against Ca(2+) overload-induced myocardial injury.
 We report that a new drug, the 1,4-benzothiazepine derivative JTV519, reverses this pathogenic process.
Protective effect of JTV519, a new 1,4-benzothiazepine derivative, on prolonged myocardial preservation.
A new 1,4-benzothiazepine derivative, JTV519 (JTV), has strong protective effects against isoproterenol-induced myocardial injury.
A new 1,4-benzothiazepine derivative, JTV519, has a strong protective effect against Ca(2+) overload-induced myocardial injury.
 In these conditions, JTV519 (K201), a 1,4-benzothiazepine derivative and multi-channel blocker, stabilizes RyR2s and decrease SR Ca?⁺ leak.
The cardioprotective effects of a new 1,4-benzothiazepine derivative, JTV519, on ischemia/reperfusion-induced Ca2+ overload in isolated rat hearts.
We report that a new drug, the 1,4-benzothiazepine derivative JTV519, reverses this pathogenic process

Answer: The 1,4-benzothiazepine derivative JTV-519 is a new type of calcium ion channel modulator.JTV-519, which has potential use as an antiarrhythmic [285800]. The drug is a novel cardioprotectant derivative of 1,4-benzothiazepine for which phase I trials were completed in the third quarter of 1998
JTV519 (K201), is a 1,4-benzothiazepine derivative and multi-channel blocker, which has been found to stabilize RyR2s and decrease SR Ca²⁺ leak.
Exact answer: 1,4-benzothiazepine, benzothiazepine