** Shares of Hansoh Pharmaceutical Group 3692.HK slip 5.4% to HK$38.06, on track for the biggest one-day pct drop since December 15
** Stock hits the lowest level since January 7
** Chinese drug maker plans to issue HK$4.68 bln ($600.17 mln) zero coupon convertible bonds due 2033, raising proceeds to fund R&D of innovative drugs for oncology, central nervous system, and metabolic and autoimmune diseases, among others
** The bonds will be convertible into 81.55 mln new shares, or 1.33% of the enlarged share capital, and that triggers concern of dilution effect on shares
** YTD, stock up 6.7%, Hang Seng Biotech Index .HSBIO up 10.4%
($1 = 7.7978 Hong Kong dollars)
(Reporting by Donny Kwok)
((donny.kwok@thomsonreuters.com))