Spitzer three-color image of the I19074 region in the mid-infrared bands (blue: 3.6 μm, green: 4.5 μm, red: 8.0 μm). The white contours represent 1.2 mm dust continuum emission from the MAMBO survey (Beuther et al. 2002), while the black contours indicate 20 cm radio continuum emission from the EFFLSBRG survey (Winkel et al. 2016). Contour levels for the 20 cm radio emission (black) start at 5 σ_{20 cm}(σ_{20 cm}=0.2 mJy beam⁻¹) and increase in steps of 5 σ_{20 cm}. The 1.2 mm dust emission (white) is contoured at [3, 5, 7, 9, 15, 21, 27, 33] × σ_{1.2 mm}, where σ_{1.2 mm}=7 mJy beam⁻¹. Cyan circles and blue plus mark the positions of identified compact sources and UC H II region by Lu et al. (2018). The cyan band outlines the S-shaped filament connecting the compact sources. The (synthesized) beams for the MAMBO (11^′′ × 11^′′) and ALMA (0.60^′′ × 0.58^′′) observations are shown in the lower-left and lower-right corners, respectively. The dashed loop shows the ALMA mosaic field. A scale bar of 0.5 pc is shown in the top right corner.