Antioxidant Activity from the Combination of Ethanolic Extract of Tea Leaves (Camellia sinensis) and Soursop Leaves (Annona muricata l.) and Optimation of the Effervescent Granule Production - Masitha, Fatma Sari; Pharmacy Study Program, Faculty of Medicine and Health Sciences, Universitas Muhammadiyah Yogyakarta (Universitas Muhammadiyah Yogyakarta, 2019)