ENZ was purchased from MSN Laboratories Private Ltd. (Telangana, India). Copovidone (Abbreviated as Kollidon VA64) and colloidal silica were supplied by Boryung Pharmaceutical. Co., Ltd. (Seoul, Republic of Korea). Hydroxypropylcellulose (Abbreviated as HPC-L) was supplied by Cosmax Pharmaceutical. Co., Ltd. (Cheongju, Republic of Korea). Hydroxypropylmethylcellulose phthalate (HPMCP HP55) was provided by Hanmi Pharmaceutical. Co., Ltd. (Seoul, Republic of Korea). N,N-dimethylaminoethyl methacrylate (abbreviated as Eudragit E PO) was obtained from Evonik (Essen, Germany). Propylene glycol dicaprylocaprate (abbreviated as Labrafa PG) and Diethylene glycol monoethyl ether (abbreviated as Transcutol P) were acquired from Gattefosse (St. Priest, France). Macrogoli 15 hydroxystearas (abbreviated as Solutol HS15) was sourced from BASF (Ludwigshafen, Germany). Sodium carboxymethyl cellulose was purchased from Duksan Chemicals (Ansan, Republic of Korea). Acetonitrile, ammonium acetate, and acetone were purchased from Daejung Chemicals (Siheung, Republic of Korea). Other chemicals used were of the appropriate class for analysis.
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