Du Du Holdings Limited — Proxy Solicitation & Information Statement 2008

Mar 12, 2008

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CORE HEALTHCARE INVESTMENT HOLDINGS LIMITED 確思醫藥投資控股有限公司[*]

(incorporated in the Cayman Islands with limited liability)

(Stock Code: 8250)

PROXY FORM

Form of proxy for use by shareholders at the extraordinary general meeting of Core Healthcare Investment Holdings Limited to be convened at Rooms 609–610, 6/F, Nan Fung Tower, 173 Des Voeux Road Central, Hong Kong on Monday, 31 March 2008 at 10:00 a.m.

I/We, (Note a)

of

being the registered holder(s) of (Note b)

shares of HK$0.001 each in the capital

of Core Healthcare Investment Holdings Limited (the “Company”), hereby appoint the Chairman of the Meeting

or

of

to act as my/our proxy (Note c) at the extraordinary general meeting of the Company to be held at Rooms 609–610, 6/F, Nan Fung Tower, 173 Des Voeux Road Central, Hong Kong on Monday, 31 March 2008 at 10:00 a.m. and at any adjournment thereof and to vote on my/our behalf as directed below.

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----- Start of picture text ----- ORDINARY RESOLUTIONS FOR AGAINST(i) To approve the re-election of Dr. Hui Ka Wah Ronnie, JP asdirector of the Company; and(ii) To approve, ratify and confirm the Co-operation Agreementand the transactions contemplated thereunder.----- End of picture text -----

Dated the day of 2008.

Shareholder’s signature (Notes (e) to (h))

Notes:

• (a) Full name(s) and address(es) to be inserted in BLOCK CAPITALS. The names of all joint holders should be stated.

• (b) Please insert the number of shares registered in your name(s). If no number is inserted, this form of proxy will be deemed to relate to all the shares in the capital of the Company registered in your name(s).

• (c) A proxy need not be a member of the Company. If you wish to appoint some person other than the Chairman of the Meeting as your proxy, please delete the words “the Chairman of the Meeting or” and insert the name and address of the person appointed as proxy in the space provided.

• (d) If you wish to vote for a resolution set out above, please tick (“√”) the boxes marked “For”. If you wish to vote against any resolutions set out above, please tick (“√”) the boxes marked “Against”. If this form returned is duly signed but without specific direction on any of the proposed resolutions, the proxy will vote for or against a resolution or abstain at his discretion in respect of the relevant resolutions. A proxy will also be entitled to vote at his discretion on any resolution properly put to the meeting other than those set out in the notice convening the meeting.

• (e) In the case of a joint holding, this form of proxy may be signed by any joint holder, but if more than one joint holders are present at the meeting, whether in person or by proxy, the joint holder whose name stands first on the register of members in respect of the relevant joint holding shall alone be entitled to vote in respect thereof.

• (f) This form of proxy must be signed by a shareholder, or his attorney duly authorised in writing, or if the shareholder is a corporation, either under its common seal or under the hand of an officer or attorney so authorised.

• (g) To be valid, this form of proxy together with any power of attorney or other authority (if any) under which it is signed or a notarially certified copy of such power or authority must be deposited at the office of the Company’s branch share registrar and transfer office in Hong Kong, Computershare Hong Kong Investor Services Limited at Shops 1712–1716, 17th Floor, Hopewell Centre, 183 Queen’s Road East, Hong Kong, not less than 48 hours before the time of the meeting or any adjourned meeting thereof.

• (h) Any alternation made to this form should be initialled by the person who signs the form.

• for identification purpose only