Here are the drugs of the ATC-code G04CA:
Medical compounds in gray rows are classified putatively.

You can do a similarity search in the last column.

(predicted) ATC	CAS	STRUCTURE	NAME	2D SIMILARITY
	Alfuzosin Alfuzosin	081403807		top 10 top 20 top 30
	Tamsulosin Tamsulosin	106133204		top 10 top 20 top 30
	Terazosin Terazosin Terazosine	063590647		top 10 top 20 top 30
	Doxazosin Doxazosin	074191858		top 10 top 20 top 30
	1-(4-Amino-6,7-Dimethoxy-2-quinazolinyl)-4-(1,4-be 1-(4-Amino-6,7-dimethoxy-2-chinazolinyl)-4-(2,3-di 74191-85-8 77883-43-3	190889		top 10 top 20 top 30
	74191-85-8 C06970 Doxazosin	9184		top 10 top 20 top 30
	106138-88-9 106463-17-6 Benzenesulfonamide, 5-(2-((2-(2-ethoxyphenoxy)ethy LY 253352	705773		top 10 top 20 top 30
	(+-)-1-(4-Amino-6,7-dimethoxy-2-quinazolinyl)-4-(2 (+-)-4-Amino-2-(4-(2-methoxypropionyl)piperazino)- 1-(4-Amino-6,7-dimethoxy-2-quinazolinyl)-4-(2-meth 116728-65-5	670512		top 10 top 20 top 30
	(-)-(R)-5-(2-((2-(o-Ethoxyphenoxy)ethyl)amino)prop 106138-88-9 106463-17-6 112101-78-7	196511		top 10 top 20 top 30
	63074-08-8 63590-64-7 Abbott-45975 Hytrin	184612		top 10 top 20 top 30
	63590-64-7 C07127 Terazosin Terazosine	9337		top 10 top 20 top 30
	5-(2-((2-(2-Methoxyphenoxy)ethyl)amino)ethyl)-2-me 94666-09-8 Benzenesulfonamide, 5-(2-((2-(2-methoxyphenoxy)eth YM 11133	724562		top 10 top 20 top 30
	C06970 Doxazosin	9184		top 10 top 20 top 30
	C07127 Terazosin Terazosine	9337		top 10 top 20 top 30