A disposable semiconductor material is deposited to form disposable semiconductor material portions on semiconductor fins. A plurality of RTWOs are is arranged into an array of rows and columns. The electronic device can further include a first doped region having the first conductivity type, wherein the first doped region extends from the drain region towards the channel region. One end of the chamfered portion is formed continuously so that a tangent thereto is in line with the annular wall, and the other end of the chamfered portion is formed to constitute a flexed portion in combination with the cylinder wall. The present invention also relates to processes for preparing said compounds, pharmaceutical compositions containing them and their use in HCV therapy.