Help Identify a Maker Mark on Porcelain Teapot

[das_Fenster2000]

I found this teapot and cannot find the maker name by the chinese character stamp.  Can anyone help? I submitted a photo of the bottom of the teapot

[peterp]

The following page is recommended for reading:
www.chinese-antique-porcelain.com/teapot-marks.html

The small area around the marks seems to point to a newer item. For this it is recommended to view the content of the text box at the bottom of this page:
www.chinese-antique-porcelain.com/yixing-pottery.html

Among Chinese toxicity of the more recent teapot clay is widely known. It is therefore recommended to avoid using newer teapots.  :-)

[Drivodina]

I find this matter to read a long time ago.