Requirement to determine whether the program is applicable to this system or not. After validation of the docking protocol, all 133 hits retrieved by employing a multiple pharmacophore model-based screening, were docked into the active site of chymase. Analysis of docking results indicated that bound ligand in the complex structure of chymase showed GOLD PS-1145 fitness score of 62.58. While, among 133 hit compounds, 21 hits demonstrated higher GOLD fitness score than the ligand bound with ILK-IN-2 chemical information crystal structure, thus, were selected for further study. In order to obtain hits which could map all available bioactive conformations at the active site of chymase, these 21 hit compounds were further docked to the other two crystal structures of chymase labeled as 1T31 and 2HVX. These two crystal structures were also employed for the development of SB_Model2 and SB_Model4. Analysis of their docked results helped in further filtering of hit compounds. Finally, four hit compounds which showed the key interactions with the critical amino acids present in the active site of protein and also exhibited higher fitness score in all three crystal structures of chymase were selected as final hits. The final hits which included KM09155, HTS00581, and HTS05891 compounds, were retrieved from Maybridge database. While, fourth hit Compound1192 was retrieved from Chembridge database. Remarkably, all final hits were identified by four different pharmacophore models. KM09155 was revealed by LB_Model with fitness value of 4.36. Although, there were three compounds retrieved by LB_Model which showed high fitness scores than KM09155, however, could not show high fitness score for structure-based models. Therefore, these compounds were not selected as final hits. The HTS00581 hit was spotted by SB_Mode2 with fitness value of 3.83. While, the third hit compound HTS05891 was also marked by SB_Mode2 with 3.68 fitness score. The fourth final hit Compound1192 was identified by two different pharmacophore models including SB_Mode1 and SB_Mode4 with fitness scores of 3.50 and 3.72, respectively. Structural diversity of final hits was measured by using Calculate Diversity Metrics protocol of DS which calculates a series of quantitative measures of diversity including number fingerprint features, number asse
