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To a suspension of N,N-bis(2-chloroethyl)benzene-1,4-diamine hydrochloride (37) (0.306 g, 1.0 mmol) in dry THF (25 mL) was added dropwise a solution of diphosgene (197 mg, 1.2 mmol) in an ice bath with vigorous stirring. After being stirred for 30 min, it formed the known crude p-[(N,N-bis(2-chloroethyl)amino)]phenylcarbamoyl chloride hydrochloride (38). The reaction mixture was then neutralized by adding Et3N (0.5 mL), continuously stirred for 10 min, filtered through a pad of Celite and washed with THF (5 mL). The filtrate and washings were combined and was added dropwise into a solution of 3-(acridin-9-yl)amino-5-hydroxymethylaniline (6, AHMA)18 (0.351 g, 1.0 mmol) in dry DMF (10 mL) containing Et3N (0.5 mL) at 0° C. After being stirred for 18 h, the reaction mixture was evaporated in vacuo to dryness and the residue was dissolved in a mixture of CHCl3/MeOH, mixed with silica gel (5 gm) and evaporated in vacuo to dryness. The residue was put on the top of a silica gel column (2×20 cm) and chromatographed using CHCl3/MeOH (100:5 v/v) as eluent. The fractions containing the main product were combined and evaporated in vacuo to dryness and residue was recrystalized from CHCl3/MeOH to give 1-[3-(acridin-9-ylamino)-5-hydroxymethylphenyl]-3-{4-[bis(2-chloroethyl)amino]phenyl}urea (15, BO-1037), 205 mg (35%); mp 173-175° C.; 1H NMR (DMSO-d6) δ 3.67 (8H, m, 4×CH2), 4.41 (2H, d, J=6.0 Hz, CH2), 5.14 (1H, t, J=6.0 Hz, exchangeable, OH), 6.37 (1H, s, ArH), 6.68 (2H, d, J=9.1 Hz, 2×ArH,), 6.81 (1H, s, ArH), 7.01 (1H, s, ArH), 7.05-7.19 (1H, m, ArH), 7.24 (2H, d, J=9.1 Hz, 2×ArH), 7.55 (4H, m, 4×ArH) 8.05 (2H, m, 2×ArH), 8.25 (1H, m, ArH) 8.46 (1H, m, ArH), 10.48 (1H, brs, exchangeable, NH). Anal. Calcd. for (C31H29Cl2N5O2): C, 63.81; H, 5.18; N, 12.00. Found: C, 64.07; H, 5.26; N, 11.87.