Page 1 Date 25 February 2020 Re: Management Discussion & Analysis for the Year Ended 31 December 20020 To The President of the Stock Exchange of Thailand (SET) CHAOPRAYAMAHANAKORN PUBLIC COMPANY

the year ended December 31, 2019 To Director and Manager the Stock Exchange of Thailand According to the Board of Directors’ Meeting No.2/ 2 0 2 0 of DOD Biotech Public Company Limited ( “ the Company

1 Ref : JSP/17/08/02 15 August 2017 Subject : Report the operating result for the quarter 2 Ending June 30, 2017 To : The Director and Manager The Stock Exchange of Thailand J.S.P. Property Public

1 Ref : JSP/17/11/01 10 November 2017 Subject : Report the operating result for the quarter 3 Ending September 30, 2017 To : The Director and Manager The Stock Exchange of Thailand J.S.P. Property

1 Ref : JSP/17/11/01 10 November 2017 Subject : Report the operating result for the quarter 3 Ending September 30, 2017 (revise) To : The Director and Manager The Stock Exchange of Thailand J.S.P

15 November 2017 Subject: Management Discussion and Analysis for the 9-Month Period Ended September 30, 2017 To: Directors and Managers The Stock Exchange of Thailand Halcyon Technology Public

-9320 1 Ref: PLC 2017/017 November 16, 2017 Subject: Management Discussion and Analysis Quarter 3 Ended 30-September-2017 (Additional) To: The President of the Stock Exchange of Thailand Panjawattana

26 February 2018 Subject: Management Discussion and Analysis for the Year Ended December 31, 2017 To: Directors and Managers The Stock Exchange of Thailand Halcyon Technology Public Company Limited

No. CC20190804ELE August 13, 2019 Re: Clarification of the changes in operation performance for the second quarter and the first half ended 30 June, 2019 Attn: The President The Stock Exchange of

No. CC20181103ELE November 12, 2018 Re: Clarification of the changes in operation performance for the third quarter and the nine- month period ended 30 September 2018 Attn: The President The Stock