EXHIBIT 31.1

EXHIBIT 31.1

CERTIFICATION

I, Chang H. Ahn, Chief Executive Officer of Rexahn Pharmaceuticals, Inc. certify
that:

1. I have reviewed this quarterly report on Form 10-QSB of Rexahn
Pharmaceuticals, Inc.

2. Based on my knowledge, this quarterly report does not contain any
untrue statement of a material fact or omit to state a material fact
necessary to make the statements made, in light of the circumstances
under which such statements were made, not misleading with respect to
the period covered by this quarterly report;

3. Based on my knowledge, the financial statements, and other financial
information included in this quarterly report, fairly present in all
material respects the financial condition, results of operations and
cash flows of the small business issuer as of, and for, the periods
presented in this quarterly report;

4. The small business issuer's other certifying officer and I are
responsible for establishing and maintaining disclosure controls and
procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e))
for the small business issuer and have:

(a) designed such disclosure controls and procedures,
or caused such disclosure controls or procedures to be designed
under my supervision, to ensure that material information
relating to the small business issuer, including its
consolidated subsidiaries, is made known to me by others within
those entities, particularly during the period in which this
quarterly report is being prepared;

(b) evaluated the effectiveness of the small business
issuer's disclosure controls and procedures and presented in
this quarterly report my conclusions about the effectiveness of
the disclosure controls and procedures, as of the end of the
period covered by this quarterly report based on such
evaluation; and

(c) disclosed in this report any change in the small
business issuer's internal control over financial reporting that
occurred during the small business issuer's most recent fiscal
quarter (the small business issuer's fourth fiscal quarter in
the case of an annual report) that has materially affected, or
is reasonably likely to materially affect, the small business
issuer's internal control over financial reporting; and

5. The small business issuer's other certifying officer and I have
disclosed, based on my most recent evaluation, to the small business
issuer's auditors and the audit committee of the small business
issuer's board of directors (or persons performing the equivalent
functions):

(a) all significant deficiencies and material
weaknesses in the design or operation of internal control over
financial reporting which are reasonably likely to adversely
affect the small business issuer's ability to record, process,
summarize and report financial information; and

(b) any fraud, whether or not material, that involves
management or other employees who have a significant role in the
small business issuer's internal control over financial
reporting.


Dated: May 23, 2005


/s/ Chang H. Ahn
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Chang H. Ahn
Chief Executive Officer