A tyrphostin EGFR inhibitor (IC50 = 0.7 μM); selectively inhibits EFGR over ErbB2 (IC50 = 35 μM); inhibits EGF-dependent growth of HER 14 cells (IC50 = 2.5 μM) as well as the growth of psoriatic keratinocytes isolated from patients with psoriasis from 1-50 μM; inhibits Mo-MuLV reverse transcriptase activity (IC50 = 10.8 μM) without affecting Mo-MuLV-infected NIH3T3 cell growth (IC50 = 210 μM)